Mercurial > hg > toybox
annotate lib/lib.c @ 369:5715eed39575
Correct return types of xstrdup() and xstrndup()
author | Rob Landley <rob@landley.net> |
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date | Tue, 05 Jan 2010 10:48:32 -0600 |
parents | 3c9f47f4fd33 |
children | c7a26e26ad08 |
rev | line source |
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1 /* vi: set sw=4 ts=4 :*/ |
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2 /* lib.c - reusable stuff. |
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3 * |
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4 * Functions with the x prefix are wrappers for library functions. They either |
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5 * succeed or kill the program with an error message, but never return failure. |
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6 * They usually have the same arguments and return value as the function they |
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7 * wrap. |
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8 * |
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9 * Copyright 2006 Rob Landley <rob@landley.net> |
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10 */ |
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11 |
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12 #include "toys.h" |
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13 |
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14 // Strcpy with size checking: exit if there's not enough space for the string. |
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15 void xstrcpy(char *dest, char *src, size_t size) |
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16 { |
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17 if (strlen(src)+1 > size) error_exit("xstrcpy"); |
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18 strcpy(dest, src); |
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19 } |
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20 |
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21 void verror_msg(char *msg, int err, va_list va) |
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22 { |
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23 char *s = ": %s"; |
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24 |
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25 fprintf(stderr, "%s: ", toys.which->name); |
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26 if (msg) vfprintf(stderr, msg, va); |
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27 else s+=2; |
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28 if (err) fprintf(stderr, s, strerror(err)); |
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29 putc('\n', stderr); |
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30 } |
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31 |
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32 void error_msg(char *msg, ...) |
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33 { |
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34 va_list va; |
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35 |
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36 va_start(va, msg); |
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37 verror_msg(msg, 0, va); |
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38 va_end(va); |
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39 } |
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40 |
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41 void perror_msg(char *msg, ...) |
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42 { |
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43 va_list va; |
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44 |
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45 va_start(va, msg); |
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46 verror_msg(msg, errno, va); |
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47 va_end(va); |
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48 } |
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49 |
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50 // Die with an error message. |
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51 void error_exit(char *msg, ...) |
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52 { |
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53 va_list va; |
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54 |
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55 if (CFG_HELP && toys.exithelp) { |
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56 *toys.optargs=*toys.argv; |
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57 USE_HELP(help_main();) // dear gcc: shut up. |
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58 fprintf(stderr,"\n"); |
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59 } |
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60 |
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61 va_start(va, msg); |
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62 verror_msg(msg, 0, va); |
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63 va_end(va); |
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64 |
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65 exit(!toys.exitval ? 1 : toys.exitval); |
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66 } |
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67 |
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68 |
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69 // Die with an error message and strerror(errno) |
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70 void perror_exit(char *msg, ...) |
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71 { |
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72 va_list va; |
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73 |
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74 va_start(va, msg); |
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75 verror_msg(msg, errno, va); |
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76 va_end(va); |
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77 |
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78 exit(!toys.exitval ? 1 : toys.exitval); |
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79 } |
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80 |
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81 // Die unless we can allocate memory. |
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82 void *xmalloc(size_t size) |
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83 { |
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84 void *ret = malloc(size); |
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85 if (!ret) error_exit("xmalloc"); |
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86 |
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87 return ret; |
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88 } |
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89 |
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90 // Die unless we can allocate prezeroed memory. |
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91 void *xzalloc(size_t size) |
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92 { |
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93 void *ret = xmalloc(size); |
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94 bzero(ret, size); |
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95 return ret; |
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96 } |
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97 |
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98 // Die unless we can change the size of an existing allocation, possibly |
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99 // moving it. (Notice different arguments from libc function.) |
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100 void *xrealloc(void *ptr, size_t size) |
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101 { |
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102 ptr = realloc(ptr, size); |
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103 if (!ptr) error_exit("xrealloc"); |
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104 |
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105 return ptr; |
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106 } |
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107 |
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108 // Die unless we can allocate a copy of this many bytes of string. |
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109 char *xstrndup(char *s, size_t n) |
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110 { |
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111 char *ret = xmalloc(++n); |
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112 strncpy(ret, s, n); |
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113 ret[--n]=0; |
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114 |
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115 return ret; |
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116 } |
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117 |
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118 // Die unless we can allocate a copy of this string. |
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119 char *xstrdup(char *s) |
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120 { |
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121 return xstrndup(s, strlen(s)); |
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122 } |
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123 |
4
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124 // Die unless we can allocate enough space to sprintf() into. |
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125 char *xmsprintf(char *format, ...) |
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126 { |
126
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127 va_list va, va2; |
4
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128 int len; |
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129 char *ret; |
156
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130 |
126
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131 va_start(va, format); |
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132 va_copy(va2, va); |
4
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133 |
126
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134 // How long is it? |
4
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135 len = vsnprintf(0, 0, format, va); |
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136 len++; |
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137 va_end(va); |
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138 |
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139 // Allocate and do the sprintf() |
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140 ret = xmalloc(len); |
156
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141 vsnprintf(ret, len, format, va2); |
126
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142 va_end(va2); |
4
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143 |
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144 return ret; |
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145 } |
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146 |
70
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147 void xprintf(char *format, ...) |
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148 { |
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149 va_list va; |
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150 va_start(va, format); |
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151 |
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152 vprintf(format, va); |
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153 if (ferror(stdout)) perror_exit("write"); |
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154 } |
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155 |
128
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156 void xputs(char *s) |
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157 { |
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158 if (EOF == puts(s)) perror_exit("write"); |
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159 } |
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160 |
70
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161 void xputc(char c) |
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162 { |
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163 if (EOF == fputc(c, stdout)) perror_exit("write"); |
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|
164 } |
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|
165 |
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|
166 void xflush(void) |
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|
167 { |
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|
168 if (fflush(stdout)) perror_exit("write");; |
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169 } |
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|
170 |
3
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Next drop of toysh, plus more infratructure.
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171 // Die unless we can exec argv[] (or run builtin command). Note that anything |
266a462ed18c
Next drop of toysh, plus more infratructure.
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172 // with a path isn't a builtin, so /bin/sh won't match the builtin sh. |
7
fc9c0503d5e2
Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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173 void xexec(char **argv) |
2
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Infrastructure, first drop of toy shell, and a bit of work on df.
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|
174 { |
3
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Next drop of toysh, plus more infratructure.
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|
175 toy_exec(argv); |
2
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176 execvp(argv[0], argv); |
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177 error_exit("No %s", argv[0]); |
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|
178 } |
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|
179 |
51 | 180 void xaccess(char *path, int flags) |
181 { | |
251
d9ddba2c7acf
Remove extra newlines on error_paths
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250
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|
182 if (access(path, flags)) perror_exit("Can't access '%s'", path); |
51 | 183 } |
184 | |
214
98820d1eaa79
Upgrade patch to understand creating and deleting files.
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|
185 // Die unless we can delete a file. (File must exist to be deleted.) |
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Upgrade patch to understand creating and deleting files.
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209
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|
186 void xunlink(char *path) |
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Upgrade patch to understand creating and deleting files.
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209
diff
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|
187 { |
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Upgrade patch to understand creating and deleting files.
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|
188 if (unlink(path)) perror_exit("unlink '%s'", path); |
98820d1eaa79
Upgrade patch to understand creating and deleting files.
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|
189 } |
98820d1eaa79
Upgrade patch to understand creating and deleting files.
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|
190 |
2
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191 // Die unless we can open/create a file, returning file descriptor. |
49
bb4c38853a7d
xopen() wants 2 arguments unless you're creating a file, in which case you
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|
192 int xcreate(char *path, int flags, int mode) |
2
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Infrastructure, first drop of toy shell, and a bit of work on df.
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|
193 { |
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Infrastructure, first drop of toy shell, and a bit of work on df.
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|
194 int fd = open(path, flags, mode); |
148
88dd003ccdf4
xcreate(): perror already prints error name and newline, remove redundancy.
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144
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|
195 if (fd == -1) perror_exit("%s", path); |
2
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196 return fd; |
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Infrastructure, first drop of toy shell, and a bit of work on df.
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|
197 } |
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Infrastructure, first drop of toy shell, and a bit of work on df.
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|
198 |
49
bb4c38853a7d
xopen() wants 2 arguments unless you're creating a file, in which case you
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199 // Die unless we can open a file, returning file descriptor. |
bb4c38853a7d
xopen() wants 2 arguments unless you're creating a file, in which case you
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|
200 int xopen(char *path, int flags) |
bb4c38853a7d
xopen() wants 2 arguments unless you're creating a file, in which case you
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44
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|
201 { |
bb4c38853a7d
xopen() wants 2 arguments unless you're creating a file, in which case you
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44
diff
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|
202 return xcreate(path, flags, 0); |
bb4c38853a7d
xopen() wants 2 arguments unless you're creating a file, in which case you
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44
diff
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|
203 } |
bb4c38853a7d
xopen() wants 2 arguments unless you're creating a file, in which case you
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44
diff
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|
204 |
201
5d523752715a
Start of "patch" support. Writes to stdout at the moment.
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197
diff
changeset
|
205 void xclose(int fd) |
5d523752715a
Start of "patch" support. Writes to stdout at the moment.
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197
diff
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|
206 { |
5d523752715a
Start of "patch" support. Writes to stdout at the moment.
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197
diff
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|
207 if (close(fd)) perror_exit("xclose"); |
5d523752715a
Start of "patch" support. Writes to stdout at the moment.
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|
208 } |
5d523752715a
Start of "patch" support. Writes to stdout at the moment.
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|
209 |
2
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|
210 // Die unless we can open/create a file, returning FILE *. |
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Infrastructure, first drop of toy shell, and a bit of work on df.
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|
211 FILE *xfopen(char *path, char *mode) |
67b517913e56
Infrastructure, first drop of toy shell, and a bit of work on df.
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|
212 { |
67b517913e56
Infrastructure, first drop of toy shell, and a bit of work on df.
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parents:
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|
213 FILE *f = fopen(path, mode); |
251
d9ddba2c7acf
Remove extra newlines on error_paths
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250
diff
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|
214 if (!f) perror_exit("No file %s", path); |
2
67b517913e56
Infrastructure, first drop of toy shell, and a bit of work on df.
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|
215 return f; |
67b517913e56
Infrastructure, first drop of toy shell, and a bit of work on df.
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diff
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|
216 } |
4
732b055e17f7
Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path().
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|
217 |
63
69efffcacd70
Add fdprintf(). Remove reread() and rewrite() which handle -EINTR, which
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diff
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|
218 // Keep reading until full or EOF |
69efffcacd70
Add fdprintf(). Remove reread() and rewrite() which handle -EINTR, which
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diff
changeset
|
219 ssize_t readall(int fd, void *buf, size_t len) |
50
63c168b65fa6
Add rewrite(), writeall(),and xwrite() to match the read versions.
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diff
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|
220 { |
63
69efffcacd70
Add fdprintf(). Remove reread() and rewrite() which handle -EINTR, which
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53
diff
changeset
|
221 size_t count = 0; |
309
79a61cd58596
Bug spotted by Roberto Foglietta: at EOF readall() should return count, not len.
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parents:
308
diff
changeset
|
222 |
63
69efffcacd70
Add fdprintf(). Remove reread() and rewrite() which handle -EINTR, which
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diff
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|
223 while (count<len) { |
69efffcacd70
Add fdprintf(). Remove reread() and rewrite() which handle -EINTR, which
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diff
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|
224 int i = read(fd, buf+count, len-count); |
309
79a61cd58596
Bug spotted by Roberto Foglietta: at EOF readall() should return count, not len.
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308
diff
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|
225 if (!i) break; |
8
04f66da2bdbf
Add reread(), readall(), and xread() on the bus ride in to work...
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|
226 if (i<0) return i; |
04f66da2bdbf
Add reread(), readall(), and xread() on the bus ride in to work...
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diff
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|
227 count += i; |
04f66da2bdbf
Add reread(), readall(), and xread() on the bus ride in to work...
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diff
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|
228 } |
04f66da2bdbf
Add reread(), readall(), and xread() on the bus ride in to work...
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|
229 |
04f66da2bdbf
Add reread(), readall(), and xread() on the bus ride in to work...
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|
230 return count; |
04f66da2bdbf
Add reread(), readall(), and xread() on the bus ride in to work...
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diff
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|
231 } |
04f66da2bdbf
Add reread(), readall(), and xread() on the bus ride in to work...
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|
232 |
50
63c168b65fa6
Add rewrite(), writeall(),and xwrite() to match the read versions.
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|
233 // Keep writing until done or EOF |
63
69efffcacd70
Add fdprintf(). Remove reread() and rewrite() which handle -EINTR, which
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diff
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|
234 ssize_t writeall(int fd, void *buf, size_t len) |
50
63c168b65fa6
Add rewrite(), writeall(),and xwrite() to match the read versions.
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|
235 { |
63
69efffcacd70
Add fdprintf(). Remove reread() and rewrite() which handle -EINTR, which
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53
diff
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|
236 size_t count = 0; |
69efffcacd70
Add fdprintf(). Remove reread() and rewrite() which handle -EINTR, which
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53
diff
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|
237 while (count<len) { |
69efffcacd70
Add fdprintf(). Remove reread() and rewrite() which handle -EINTR, which
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|
238 int i = write(fd, buf+count, len-count); |
69efffcacd70
Add fdprintf(). Remove reread() and rewrite() which handle -EINTR, which
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parents:
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diff
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|
239 if (i<1) return i; |
50
63c168b65fa6
Add rewrite(), writeall(),and xwrite() to match the read versions.
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49
diff
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|
240 count += i; |
63c168b65fa6
Add rewrite(), writeall(),and xwrite() to match the read versions.
Rob Landley <rob@landley.net>
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49
diff
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|
241 } |
63c168b65fa6
Add rewrite(), writeall(),and xwrite() to match the read versions.
Rob Landley <rob@landley.net>
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49
diff
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|
242 |
63c168b65fa6
Add rewrite(), writeall(),and xwrite() to match the read versions.
Rob Landley <rob@landley.net>
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49
diff
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|
243 return count; |
63c168b65fa6
Add rewrite(), writeall(),and xwrite() to match the read versions.
Rob Landley <rob@landley.net>
parents:
49
diff
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|
244 } |
63c168b65fa6
Add rewrite(), writeall(),and xwrite() to match the read versions.
Rob Landley <rob@landley.net>
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49
diff
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|
245 |
53
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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diff
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|
246 // Die if there's an error other than EOF. |
63
69efffcacd70
Add fdprintf(). Remove reread() and rewrite() which handle -EINTR, which
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diff
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247 size_t xread(int fd, void *buf, size_t len) |
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248 { |
63
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249 len = read(fd, buf, len); |
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250 if (len < 0) perror_exit("xread"); |
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251 |
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252 return len; |
53
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253 } |
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254 |
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255 void xreadall(int fd, void *buf, size_t len) |
53
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256 { |
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257 if (len != readall(fd, buf, len)) perror_exit("xreadall"); |
53
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258 } |
4
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259 |
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260 // There's no xwriteall(), just xwrite(). When we read, there may or may not |
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261 // be more data waiting. When we write, there is data and it had better go |
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262 // somewhere. |
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263 |
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264 void xwrite(int fd, void *buf, size_t len) |
50
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265 { |
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266 if (len != writeall(fd, buf, len)) perror_exit("xwrite"); |
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267 } |
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268 |
340 | 269 // Die if lseek fails, probably due to being called on a pipe. |
270 | |
271 off_t xlseek(int fd, off_t offset, int whence) | |
272 { | |
273 offset = lseek(fd, offset, whence); | |
274 if (offset<0) perror_exit("lseek"); | |
275 | |
276 return offset; | |
277 } | |
278 | |
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279 char *xgetcwd(void) |
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280 { |
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281 char *buf = getcwd(NULL, 0); |
70
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282 if (!buf) perror_exit("xgetcwd"); |
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283 |
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284 return buf; |
4
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285 } |
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286 |
95
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287 void xstat(char *path, struct stat *st) |
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288 { |
252
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289 if(stat(path, st)) perror_exit("Can't stat %s", path); |
95
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290 } |
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291 |
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292 // Cannonicalizes path by removing ".", "..", and "//" elements. This is not |
44 | 293 // the same as realpath(), where "dir/.." could wind up somewhere else by |
294 // following symlinks. | |
16
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295 char *xabspath(char *path) |
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296 { |
16
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297 char *from, *to; |
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298 |
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299 // If this isn't an absolute path, make it one with cwd. |
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300 if (path[0]!='/') { |
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301 char *cwd=xgetcwd(); |
252
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302 path = xmsprintf("%s/%s", cwd, path); |
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303 free(cwd); |
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304 } else path = xstrdup(path); |
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305 |
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306 // Loop through path elements |
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307 from = to = path; |
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308 while (*from) { |
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309 |
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310 // Continue any current path component. |
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311 if (*from!='/') { |
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312 *(to++) = *(from++); |
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313 continue; |
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314 } |
4
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315 |
16
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316 // Skip duplicate slashes. |
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317 while (*from=='/') from++; |
156
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318 |
16
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319 // Start of a new filename. Handle . and .. |
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320 while (*from=='.') { |
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321 // Skip . |
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322 if (from[1]=='/') from += 2; |
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323 else if (!from[1]) from++; |
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324 // Back up for .. |
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325 else if (from[1]=='.') { |
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326 if (from[2]=='/') from +=3; |
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327 else if(!from[2]) from+=2; |
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328 else break; |
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329 while (to>path && *(--to)!='/'); |
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330 } else break; |
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331 } |
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332 // Add directory separator slash. |
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333 *(to++) = '/'; |
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334 } |
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335 *to = 0; |
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336 |
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337 return path; |
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338 } |
4
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339 |
292
b4077be6c746
Update mdev to work around the newest sysfs api breakage in the 2.6.25 kernel.
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340 void xchdir(char *path) |
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341 { |
344 | 342 if (chdir(path)) error_exit("chdir '%s'", path); |
292
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343 } |
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344 |
216
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345 // Ensure entire path exists. |
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346 // If mode != -1 set permissions on newly created dirs. |
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347 // Requires that path string be writable (for temporary null terminators). |
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348 void xmkpath(char *path, int mode) |
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349 { |
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350 char *p, old; |
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351 mode_t mask; |
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352 int rc; |
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353 struct stat st; |
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354 |
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355 for (p = path; ; p++) { |
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356 if (!*p || *p == '/') { |
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357 old = *p; |
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358 *p = rc = 0; |
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359 if (stat(path, &st) || !S_ISDIR(st.st_mode)) { |
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360 if (mode != -1) { |
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361 mask=umask(0); |
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362 rc = mkdir(path, mode); |
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363 umask(mask); |
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364 } else rc = mkdir(path, 0777); |
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365 } |
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366 *p = old; |
252
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367 if(rc) perror_exit("mkpath '%s'", path); |
216
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368 } |
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369 if (!*p) break; |
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370 } |
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371 } |
20
3981c96f9285
Implement which. Add hello world to menuconfig. Wrap the various applet main
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372 // Find all file in a colon-separated path with access type "type" (generally |
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373 // X_OK or R_OK). Returns a list of absolute paths to each file found, in |
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374 // order. |
16
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375 |
20
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376 struct string_list *find_in_path(char *path, char *filename) |
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377 { |
295
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378 struct string_list *rlist = NULL, **prlist=&rlist; |
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379 char *cwd = xgetcwd(); |
16
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380 |
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381 for (;;) { |
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382 char *next = path ? index(path, ':') : NULL; |
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383 int len = next ? next-path : strlen(path); |
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384 struct string_list *rnext; |
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385 struct stat st; |
16
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386 |
20
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387 rnext = xmalloc(sizeof(void *) + strlen(filename) |
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388 + (len ? len : strlen(cwd)) + 2); |
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389 if (!len) sprintf(rnext->str, "%s/%s", cwd, filename); |
16
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390 else { |
20
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391 char *res = rnext->str; |
16
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392 strncpy(res, path, len); |
20
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393 res += len; |
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394 *(res++) = '/'; |
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395 strcpy(res, filename); |
16
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396 } |
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397 |
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398 // Confirm it's not a directory. |
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399 if (!stat(rnext->str, &st) && S_ISREG(st.st_mode)) { |
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400 *prlist = rnext; |
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401 rnext->next = NULL; |
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402 prlist = &(rnext->next); |
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403 } else free(rnext); |
16
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404 |
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405 if (!next) break; |
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406 path += len; |
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407 path++; |
4
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408 } |
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409 free(cwd); |
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410 |
20
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411 return rlist; |
4
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412 } |
7
fc9c0503d5e2
Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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413 |
fc9c0503d5e2
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414 // Convert unsigned int to ascii, writing into supplied buffer. A truncated |
fc9c0503d5e2
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415 // result contains the first few digits of the result ala strncpy, and is |
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416 // always null terminated (unless buflen is 0). |
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417 void utoa_to_buf(unsigned n, char *buf, unsigned buflen) |
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418 { |
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419 int i, out = 0; |
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420 |
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421 if (buflen) { |
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422 for (i=1000000000; i; i/=10) { |
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423 int res = n/i; |
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424 |
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425 if ((res || out || i == 1) && --buflen>0) { |
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426 out++; |
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427 n -= res*i; |
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428 *buf++ = '0' + res; |
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429 } |
fc9c0503d5e2
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430 } |
fc9c0503d5e2
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431 *buf = 0; |
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432 } |
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433 } |
fc9c0503d5e2
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434 |
fc9c0503d5e2
Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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435 // Convert signed integer to ascii, using utoa_to_buf() |
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436 void itoa_to_buf(int n, char *buf, unsigned buflen) |
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437 { |
fc9c0503d5e2
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|
438 if (buflen && n<0) { |
fc9c0503d5e2
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439 n = -n; |
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440 *buf++ = '-'; |
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441 buflen--; |
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442 } |
fc9c0503d5e2
Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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443 utoa_to_buf((unsigned)n, buf, buflen); |
fc9c0503d5e2
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444 } |
fc9c0503d5e2
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445 |
fc9c0503d5e2
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446 // This static buffer is used by both utoa() and itoa(), calling either one a |
fc9c0503d5e2
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447 // second time will overwrite the previous results. |
fc9c0503d5e2
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448 // |
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449 // The longest 32 bit integer is -2 billion plus a null terminator: 12 bytes. |
fc9c0503d5e2
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450 // Note that int is always 32 bits on any remotely unix-like system, see |
fc9c0503d5e2
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451 // http://www.unix.org/whitepapers/64bit.html for details. |
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452 |
fc9c0503d5e2
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453 static char itoa_buf[12]; |
fc9c0503d5e2
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|
454 |
fc9c0503d5e2
Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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455 // Convert unsigned integer to ascii, returning a static buffer. |
fc9c0503d5e2
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456 char *utoa(unsigned n) |
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457 { |
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458 utoa_to_buf(n, itoa_buf, sizeof(itoa_buf)); |
fc9c0503d5e2
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459 |
fc9c0503d5e2
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460 return itoa_buf; |
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|
461 } |
fc9c0503d5e2
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462 |
fc9c0503d5e2
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|
463 char *itoa(int n) |
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464 { |
fc9c0503d5e2
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465 itoa_to_buf(n, itoa_buf, sizeof(itoa_buf)); |
fc9c0503d5e2
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466 |
fc9c0503d5e2
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467 return itoa_buf; |
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468 } |
53
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
469 |
102
aa4fa2543a65
Add atolx() which understands extensions for kilobytes and megabytes and such.
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470 // atol() with the kilo/mega/giga/tera/peta/exa extensions. |
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471 // (zetta and yotta don't fit in 64 bits.) |
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472 long atolx(char *c) |
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473 { |
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474 char *suffixes="kmgtpe", *end; |
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475 long val = strtol(c, &c, 0); |
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476 |
149
58554af48c8b
Fix from Charlie Shepherd: at end of string, don't match the null terminator
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|
477 if (*c) { |
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Fix from Charlie Shepherd: at end of string, don't match the null terminator
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478 end = strchr(suffixes, tolower(*c)); |
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479 if (end) val *= 1024L<<((end-suffixes)*10); |
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480 } |
102
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481 return val; |
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482 } |
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Add atolx() which understands extensions for kilobytes and megabytes and such.
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483 |
53
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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484 // Return how long the file at fd is, if there's any way to determine it. |
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485 off_t fdlength(int fd) |
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486 { |
310
8b8116214b1c
Roberto Foglietta pointed out that readall() needs fdlength() to restore
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487 off_t bottom = 0, top = 0, pos, old; |
75
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488 int size; |
53
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489 |
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490 // If the ioctl works for this, return it. |
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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491 |
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492 if (ioctl(fd, BLKGETSIZE, &size) >= 0) return size*512L; |
53
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493 |
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494 // If not, do a binary search for the last location we can read. (Some |
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495 // block devices don't do BLKGETSIZE right.) This should probably have |
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496 // a CONFIG option... |
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497 |
310
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498 old = lseek(fd, 0, SEEK_CUR); |
53
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499 do { |
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500 char temp; |
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501 |
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502 pos = bottom + (top - bottom) / 2; |
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503 |
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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504 // If we can read from the current location, it's bigger. |
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505 |
77
8018c40605d9
The fdlength() ioctl apparently doesn't work on files (and the lseek trick
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506 if (lseek(fd, pos, 0)>=0 && read(fd, &temp, 1)==1) { |
53
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507 if (bottom == top) bottom = top = (top+1) * 2; |
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508 else bottom = pos; |
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509 |
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510 // If we can't, it's smaller. |
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511 |
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512 } else { |
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513 if (bottom == top) { |
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514 if (!top) return 0; |
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515 bottom = top/2; |
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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516 } else top = pos; |
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517 } |
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518 } while (bottom + 1 != top); |
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519 |
310
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520 lseek(fd, old, SEEK_SET); |
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Roberto Foglietta pointed out that readall() needs fdlength() to restore
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521 |
53
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|
522 return pos + 1; |
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523 } |
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524 |
115
19b5567f0a1b
Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
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525 // This can return null (meaning file not found). It just won't return null |
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diff
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526 // for memory allocation reasons. |
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Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
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|
527 char *xreadlink(char *name) |
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528 { |
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|
529 int len, size = 0; |
19b5567f0a1b
Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
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530 char *buf = 0; |
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102
diff
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|
531 |
19b5567f0a1b
Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
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|
532 // Grow by 64 byte chunks until it's big enough. |
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Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
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533 for(;;) { |
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Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
Rob Landley <rob@landley.net>
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|
534 size +=64; |
19b5567f0a1b
Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
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diff
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|
535 buf = xrealloc(buf, size); |
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parents:
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|
536 len = readlink(name, buf, size); |
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Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
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diff
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|
537 |
19b5567f0a1b
Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
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|
538 if (len<0) { |
19b5567f0a1b
Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
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|
539 free(buf); |
19b5567f0a1b
Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
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diff
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|
540 return 0; |
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102
diff
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|
541 } |
19b5567f0a1b
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Rob Landley <rob@landley.net>
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diff
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|
542 if (len<size) { |
19b5567f0a1b
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|
543 buf[len]=0; |
19b5567f0a1b
Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
Rob Landley <rob@landley.net>
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|
544 return buf; |
19b5567f0a1b
Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
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102
diff
changeset
|
545 } |
19b5567f0a1b
Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
Rob Landley <rob@landley.net>
parents:
102
diff
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|
546 } |
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Rob Landley <rob@landley.net>
parents:
102
diff
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|
547 } |
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Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
Rob Landley <rob@landley.net>
parents:
102
diff
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|
548 |
77
8018c40605d9
The fdlength() ioctl apparently doesn't work on files (and the lseek trick
Rob Landley <rob@landley.net>
parents:
75
diff
changeset
|
549 /* |
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The fdlength() ioctl apparently doesn't work on files (and the lseek trick
Rob Landley <rob@landley.net>
parents:
75
diff
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|
550 This might be of use or might not. Unknown yet... |
8018c40605d9
The fdlength() ioctl apparently doesn't work on files (and the lseek trick
Rob Landley <rob@landley.net>
parents:
75
diff
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|
551 |
53
41d55b5d49fd
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52
diff
changeset
|
552 // Read contents of file as a single freshly allocated nul-terminated string. |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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52
diff
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|
553 char *readfile(char *name) |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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diff
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|
554 { |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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diff
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|
555 off_t len; |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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parents:
52
diff
changeset
|
556 int fd; |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
557 char *buf; |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
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|
558 |
156
1e8f4b05cb65
Remove trailing whitespace (thanks to Charlie Shepherd), and a couple comment
Rob Landley <rob@landley.net>
parents:
153
diff
changeset
|
559 fd = open(name, O_RDONLY); |
53
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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parents:
52
diff
changeset
|
560 if (fd == -1) return 0; |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
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|
561 len = fdlength(fd); |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
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52
diff
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|
562 buf = xmalloc(len+1); |
311
962bbf7341f8
Tweak from Roberto Foglietta.
Rob Landley <rob@landley.net>
parents:
310
diff
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|
563 buf[xreadall(fd, buf, len)] = 0; |
53
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
564 |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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52
diff
changeset
|
565 return buf; |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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52
diff
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|
566 } |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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52
diff
changeset
|
567 |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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52
diff
changeset
|
568 char *xreadfile(char *name) |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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parents:
52
diff
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|
569 { |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
570 char *buf = readfile(name); |
70
a1b464bbef08
Add "echo". Has -n and -e (but not \0123 yet).
Rob Landley <rob@landley.net>
parents:
63
diff
changeset
|
571 if (!buf) perror_exit("xreadfile %s", name); |
53
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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parents:
52
diff
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|
572 return buf; |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
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|
573 } |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
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|
574 |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
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52
diff
changeset
|
575 */ |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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parents:
52
diff
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|
576 |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
577 // Open a /var/run/NAME.pid file, dying if we can't write it or if it currently |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
578 // exists and is this executable. |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
579 void xpidfile(char *name) |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
580 { |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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parents:
52
diff
changeset
|
581 char pidfile[256], spid[32]; |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
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52
diff
changeset
|
582 int i, fd; |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
583 pid_t pid; |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
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52
diff
changeset
|
584 |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
585 sprintf(pidfile, "/var/run/%s.pid", name); |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
586 // Try three times to open the sucker. |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
587 for (i=0; i<3; i++) { |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
588 fd = open(pidfile, O_CREAT|O_EXCL, 0644); |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
589 if (fd != -1) break; |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
590 |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
591 // If it already existed, read it. Loop for race condition. |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
592 fd = open(pidfile, O_RDONLY); |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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parents:
52
diff
changeset
|
593 if (fd == -1) continue; |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
594 |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
595 // Is the old program still there? |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
596 spid[xread(fd, spid, sizeof(spid)-1)] = 0; |
41d55b5d49fd
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597 close(fd); |
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598 pid = atoi(spid); |
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599 if (fd < 1 || kill(pid, 0) == ESRCH) unlink(pidfile); |
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600 |
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601 // An else with more sanity checking might be nice here. |
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602 } |
156
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603 |
53
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604 if (i == 3) error_exit("xpidfile %s", name); |
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605 |
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606 xwrite(fd, spid, sprintf(spid, "%ld\n", (long)getpid())); |
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607 close(fd); |
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608 } |
185
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609 |
308 | 610 // Iterate through an array of files, opening each one and calling a function |
611 // on that filehandle and name. The special filename "-" means stdin if | |
612 // flags is O_RDONLY, stdout otherwise. An empty argument list calls | |
613 // function() on just stdin/stdout. | |
614 // | |
615 // Note: read only filehandles are automatically closed when function() | |
616 // returns, but writeable filehandles must be close by function() | |
617 void loopfiles_rw(char **argv, int flags, void (*function)(int fd, char *name)) | |
185
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618 { |
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619 int fd; |
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620 |
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621 // If no arguments, read from stdin. |
308 | 622 if (!*argv) function(flags ? 1 : 0, "-"); |
185
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623 else do { |
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624 // Filename "-" means read from stdin. |
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625 // Inability to open a file prints a warning, but doesn't exit. |
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626 |
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627 if (!strcmp(*argv,"-")) fd=0; |
308 | 628 else if (0>(fd = open(*argv, flags, 0666))) { |
252
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629 perror_msg("%s", *argv); |
185
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630 toys.exitval = 1; |
220
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631 continue; |
185
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632 } |
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633 function(fd, *argv); |
308 | 634 if (!flags) close(fd); |
185
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635 } while (*++argv); |
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636 } |
201
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637 |
308 | 638 // Call loopfiles_rw with O_RDONLY (common case). |
639 void loopfiles(char **argv, void (*function)(int fd, char *name)) | |
640 { | |
641 loopfiles_rw(argv, O_RDONLY, function); | |
642 } | |
643 | |
201
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644 // Slow, but small. |
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645 |
284
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646 char *get_rawline(int fd, long *plen, char end) |
201
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647 { |
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648 char c, *buf = NULL; |
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649 long len = 0; |
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650 |
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651 for (;;) { |
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652 if (1>read(fd, &c, 1)) break; |
354
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653 if (!(len & 63)) buf=xrealloc(buf, len+65); |
284
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654 if ((buf[len++]=c) == end) break; |
201
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655 } |
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656 if (buf) buf[len]=0; |
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657 if (plen) *plen = len; |
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658 |
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659 return buf; |
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660 } |
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661 |
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662 char *get_line(int fd) |
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663 { |
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664 long len; |
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665 char *buf = get_rawline(fd, &len, '\n'); |
201
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666 |
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667 if (buf && buf[--len]=='\n') buf[len]=0; |
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668 |
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669 return buf; |
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670 } |
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671 |
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672 // Copy the rest of in to out and close both files. |
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673 |
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674 void xsendfile(int in, int out) |
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675 { |
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676 long len; |
209 | 677 char buf[4096]; |
201
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678 |
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679 if (in<0) return; |
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680 for (;;) { |
209 | 681 len = xread(in, buf, 4096); |
201
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682 if (len<1) break; |
209 | 683 xwrite(out, buf, len); |
201
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684 } |
209 | 685 } |
686 | |
687 // Open a temporary file to copy an existing file into. | |
688 int copy_tempfile(int fdin, char *name, char **tempname) | |
689 { | |
690 struct stat statbuf; | |
691 int fd; | |
692 | |
693 *tempname = xstrndup(name, strlen(name)+6); | |
694 strcat(*tempname,"XXXXXX"); | |
695 if(-1 == (fd = mkstemp(*tempname))) error_exit("no temp file"); | |
696 | |
697 // Set permissions of output file | |
698 | |
699 fstat(fdin, &statbuf); | |
700 fchmod(fd, statbuf.st_mode); | |
701 | |
702 return fd; | |
201
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703 } |
209 | 704 |
705 // Abort the copy and delete the temporary file. | |
706 void delete_tempfile(int fdin, int fdout, char **tempname) | |
707 { | |
708 close(fdin); | |
709 close(fdout); | |
710 unlink(*tempname); | |
711 free(*tempname); | |
712 *tempname = NULL; | |
713 } | |
714 | |
715 // Copy the rest of the data and replace the original with the copy. | |
716 void replace_tempfile(int fdin, int fdout, char **tempname) | |
717 { | |
718 char *temp = xstrdup(*tempname); | |
719 | |
720 temp[strlen(temp)-6]=0; | |
721 if (fdin != -1) { | |
722 xsendfile(fdin, fdout); | |
723 xclose(fdin); | |
724 } | |
725 xclose(fdout); | |
726 rename(*tempname, temp); | |
727 free(*tempname); | |
728 free(temp); | |
729 *tempname = NULL; | |
730 } | |
334
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731 |
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732 // Create a 256 entry CRC32 lookup table. |
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733 |
337
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Add -N, -I, -L, and -P options to cksum.
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734 void crc_init(unsigned int *crc_table, int little_endian) |
334
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735 { |
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736 unsigned int i; |
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737 |
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738 // Init the CRC32 table (big endian) |
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739 for (i=0; i<256; i++) { |
337
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740 unsigned int j, c = little_endian ? i : i<<24; |
334
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741 for (j=8; j; j--) |
337
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742 if (little_endian) c = (c&1) ? (c>>1)^0xEDB88320 : c>>1; |
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743 else c=c&0x80000000 ? (c<<1)^0x04c11db7 : (c<<1); |
334
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744 crc_table[i] = c; |
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745 } |
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746 } |