Mercurial > hg > toybox
annotate lib/lib.c @ 234:163498bf547b
Move NEWTOY() list from end of toylist.h to generated/newtoys.h.
author | Rob Landley <rob@landley.net> |
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date | Sat, 19 Jan 2008 17:43:27 -0600 |
parents | 104792581cc9 |
children | 67a0839bda77 |
rev | line source |
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1 /* vi: set sw=4 ts=4 :*/ |
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2 /* functions.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 fprintf(stderr, "%s: ", toys.which->name); |
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24 vfprintf(stderr, msg, va); |
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25 if (err) fprintf(stderr, ": %s", strerror(err)); |
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26 putc('\n', stderr); |
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27 } |
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28 |
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29 void error_msg(char *msg, ...) |
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30 { |
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31 va_list va; |
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32 |
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33 va_start(va, msg); |
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34 verror_msg(msg, 0, va); |
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35 va_end(va); |
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36 } |
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37 |
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38 void perror_msg(char *msg, ...) |
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39 { |
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40 va_list va; |
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41 |
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42 va_start(va, msg); |
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43 verror_msg(msg, errno, va); |
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44 va_end(va); |
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45 } |
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46 |
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47 // Die with an error message. |
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48 void error_exit(char *msg, ...) |
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49 { |
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50 va_list va; |
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51 |
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52 if (CFG_HELP && toys.exithelp) { |
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53 *toys.optargs=*toys.argv; |
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54 USE_HELP(help_main();) // dear gcc: shut up. |
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55 fprintf(stderr,"\n"); |
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56 } |
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57 |
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58 va_start(va, msg); |
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59 verror_msg(msg, 0, va); |
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60 va_end(va); |
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61 |
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62 exit(!toys.exitval ? 1 : toys.exitval); |
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63 } |
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64 |
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65 |
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66 // Die with an error message and strerror(errno) |
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67 void perror_exit(char *msg, ...) |
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68 { |
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69 va_list va; |
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70 |
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71 va_start(va, msg); |
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72 verror_msg(msg, errno, va); |
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73 va_end(va); |
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74 |
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75 exit(!toys.exitval ? 1 : toys.exitval); |
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76 } |
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77 |
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78 // Die unless we can allocate memory. |
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79 void *xmalloc(size_t size) |
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80 { |
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81 void *ret = malloc(size); |
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82 if (!ret) error_exit("xmalloc"); |
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83 |
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84 return ret; |
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85 } |
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86 |
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87 // Die unless we can allocate prezeroed memory. |
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88 void *xzalloc(size_t size) |
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89 { |
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90 void *ret = xmalloc(size); |
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91 bzero(ret,size); |
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92 return ret; |
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93 } |
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94 |
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95 // Die unless we can change the size of an existing allocation, possibly |
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96 // moving it. (Notice different arguments from libc function.) |
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97 void *xrealloc(void *ptr, size_t size) |
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98 { |
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99 ptr = realloc(ptr, size); |
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100 if (!ptr) error_exit("xrealloc"); |
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101 |
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102 return ptr; |
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103 } |
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104 |
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105 // Die unless we can allocate a copy of this many bytes of string. |
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106 void *xstrndup(char *s, size_t n) |
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107 { |
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108 void *ret = xmalloc(++n); |
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109 xstrcpy(ret, s, n); |
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110 |
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111 return ret; |
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112 } |
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113 |
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114 // Die unless we can allocate a copy of this string. |
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115 void *xstrdup(char *s) |
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116 { |
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117 return xstrndup(s,strlen(s)); |
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118 } |
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119 |
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120 // Die unless we can allocate enough space to sprintf() into. |
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121 char *xmsprintf(char *format, ...) |
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122 { |
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123 va_list va, va2; |
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124 int len; |
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125 char *ret; |
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126 |
126
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127 va_start(va, format); |
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128 va_copy(va2, va); |
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129 |
126
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130 // How long is it? |
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131 len = vsnprintf(0, 0, format, va); |
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132 len++; |
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133 va_end(va); |
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134 |
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135 // Allocate and do the sprintf() |
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136 ret = xmalloc(len); |
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137 vsnprintf(ret, len, format, va2); |
126
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138 va_end(va2); |
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139 |
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140 return ret; |
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141 } |
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142 |
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143 void xprintf(char *format, ...) |
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144 { |
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145 va_list va; |
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146 va_start(va, format); |
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147 |
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148 vprintf(format, va); |
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149 if (ferror(stdout)) perror_exit("write"); |
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150 } |
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151 |
128
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152 void xputs(char *s) |
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153 { |
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154 if (EOF == puts(s)) perror_exit("write"); |
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155 } |
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156 |
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157 void xputc(char c) |
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158 { |
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159 if (EOF == fputc(c, stdout)) perror_exit("write"); |
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160 } |
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161 |
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162 void xflush(void) |
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163 { |
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164 if (fflush(stdout)) perror_exit("write");; |
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165 } |
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166 |
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167 // Die unless we can exec argv[] (or run builtin command). Note that anything |
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168 // with a path isn't a builtin, so /bin/sh won't match the builtin sh. |
7
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Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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169 void xexec(char **argv) |
2
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170 { |
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171 toy_exec(argv); |
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172 execvp(argv[0], argv); |
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173 error_exit("No %s", argv[0]); |
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174 } |
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175 |
51 | 176 void xaccess(char *path, int flags) |
177 { | |
70
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178 if (access(path, flags)) perror_exit("Can't access '%s'\n", path); |
51 | 179 } |
180 | |
214
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181 // Die unless we can delete a file. (File must exist to be deleted.) |
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182 void xunlink(char *path) |
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183 { |
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184 if (unlink(path)) perror_exit("unlink '%s'", path); |
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185 } |
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186 |
2
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187 // Die unless we can open/create a file, returning file descriptor. |
49
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188 int xcreate(char *path, int flags, int mode) |
2
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189 { |
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190 int fd = open(path, flags, mode); |
148
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191 if (fd == -1) perror_exit("%s", path); |
2
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192 return fd; |
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193 } |
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194 |
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195 // Die unless we can open a file, returning file descriptor. |
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196 int xopen(char *path, int flags) |
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197 { |
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198 return xcreate(path, flags, 0); |
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199 } |
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200 |
201
5d523752715a
Start of "patch" support. Writes to stdout at the moment.
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|
201 void xclose(int fd) |
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Start of "patch" support. Writes to stdout at the moment.
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202 { |
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203 if (close(fd)) perror_exit("xclose"); |
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Start of "patch" support. Writes to stdout at the moment.
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204 } |
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205 |
2
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206 // Die unless we can open/create a file, returning FILE *. |
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207 FILE *xfopen(char *path, char *mode) |
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208 { |
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209 FILE *f = fopen(path, mode); |
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210 if (!f) perror_exit("No file %s\n", path); |
2
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211 return f; |
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212 } |
4
732b055e17f7
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213 |
63
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214 // Keep reading until full or EOF |
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215 ssize_t readall(int fd, void *buf, size_t len) |
50
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Add rewrite(), writeall(),and xwrite() to match the read versions.
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216 { |
63
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|
217 size_t count = 0; |
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218 while (count<len) { |
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219 int i = read(fd, buf+count, len-count); |
8
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Add reread(), readall(), and xread() on the bus ride in to work...
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220 if (!i) return len; |
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221 if (i<0) return i; |
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222 count += i; |
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223 } |
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224 |
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225 return count; |
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226 } |
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227 |
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228 // Keep writing until done or EOF |
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229 ssize_t writeall(int fd, void *buf, size_t len) |
50
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230 { |
63
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231 size_t count = 0; |
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232 while (count<len) { |
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233 int i = write(fd, buf+count, len-count); |
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234 if (i<1) return i; |
50
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235 count += i; |
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|
236 } |
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237 |
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238 return count; |
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Add rewrite(), writeall(),and xwrite() to match the read versions.
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|
239 } |
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240 |
53
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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241 // Die if there's an error other than EOF. |
63
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242 size_t xread(int fd, void *buf, size_t len) |
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243 { |
63
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244 len = read(fd, buf, len); |
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245 if (len < 0) perror_exit("xread"); |
53
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246 |
63
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247 return len; |
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248 } |
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249 |
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250 void xreadall(int fd, void *buf, size_t len) |
53
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251 { |
63
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252 if (len != readall(fd, buf, len)) perror_exit("xreadall"); |
53
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253 } |
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254 |
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255 // There's no xwriteall(), just xwrite(). When we read, there may or may not |
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256 // be more data waiting. When we write, there is data and it had better go |
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257 // somewhere. |
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258 |
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259 void xwrite(int fd, void *buf, size_t len) |
50
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260 { |
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261 if (len != writeall(fd, buf, len)) perror_exit("xwrite"); |
50
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262 } |
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263 |
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264 char *xgetcwd(void) |
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265 { |
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266 char *buf = getcwd(NULL, 0); |
70
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267 if (!buf) perror_exit("xgetcwd"); |
7
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268 |
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269 return buf; |
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270 } |
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271 |
95
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272 void xstat(char *path, struct stat *st) |
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273 { |
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274 if(stat(path, st)) perror_exit("Can't stat %s\n",path); |
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275 } |
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276 |
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277 // Cannonicalizes path by removing ".", "..", and "//" elements. This is not |
44 | 278 // the same as realpath(), where "dir/.." could wind up somewhere else by |
279 // following symlinks. | |
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280 char *xabspath(char *path) |
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281 { |
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282 char *from, *to; |
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283 |
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284 // If this isn't an absolute path, make it one with cwd. |
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285 if (path[0]!='/') { |
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286 char *cwd=xgetcwd(); |
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287 path = xmsprintf("%s/%s",cwd,path); |
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288 free(cwd); |
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289 } else path = xstrdup(path); |
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290 |
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291 // Loop through path elements |
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292 from = to = path; |
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293 while (*from) { |
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294 |
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295 // Continue any current path component. |
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296 if (*from!='/') { |
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297 *(to++) = *(from++); |
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298 continue; |
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299 } |
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300 |
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301 // Skip duplicate slashes. |
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302 while (*from=='/') from++; |
156
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303 |
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304 // Start of a new filename. Handle . and .. |
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305 while (*from=='.') { |
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306 // Skip . |
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307 if (from[1]=='/') from += 2; |
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308 else if (!from[1]) from++; |
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309 // Back up for .. |
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310 else if (from[1]=='.') { |
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311 if (from[2]=='/') from +=3; |
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312 else if(!from[2]) from+=2; |
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313 else break; |
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314 while (to>path && *(--to)!='/'); |
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315 } else break; |
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316 } |
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317 // Add directory separator slash. |
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318 *(to++) = '/'; |
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319 } |
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320 *to = 0; |
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321 |
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322 return path; |
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323 } |
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324 |
216
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325 // Ensure entire path exists. |
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326 // If mode != -1 set permissions on newly created dirs. |
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327 // Requires that path string be writable (for temporary null terminators). |
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328 void xmkpath(char *path, int mode) |
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329 { |
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330 char *p, old; |
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331 mode_t mask; |
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332 int rc; |
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333 struct stat st; |
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334 |
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335 for (p = path; ; p++) { |
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336 if (!*p || *p == '/') { |
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337 old = *p; |
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338 *p = rc = 0; |
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339 if (stat(path, &st) || !S_ISDIR(st.st_mode)) { |
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340 if (mode != -1) { |
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341 mask=umask(0); |
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342 rc = mkdir(path, mode); |
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343 umask(mask); |
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344 } else rc = mkdir(path, 0777); |
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345 } |
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346 *p = old; |
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347 if(rc) perror_exit("mkpath '%s'",path); |
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348 } |
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349 if (!*p) break; |
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350 } |
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351 } |
20
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352 // Find all file in a colon-separated path with access type "type" (generally |
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353 // X_OK or R_OK). Returns a list of absolute paths to each file found, in |
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354 // order. |
16
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355 |
20
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356 struct string_list *find_in_path(char *path, char *filename) |
16
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357 { |
20
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358 struct string_list *rlist = NULL; |
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359 char *cwd = xgetcwd(); |
16
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360 |
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361 for (;;) { |
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362 char *next = path ? index(path, ':') : NULL; |
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Add xabspath(), is_file_type(), which_in_path(), and find_in_path().
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363 int len = next ? next-path : strlen(path); |
20
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364 struct string_list *rnext; |
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365 struct stat st; |
16
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Add xabspath(), is_file_type(), which_in_path(), and find_in_path().
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366 |
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367 rnext = xmalloc(sizeof(void *) + strlen(filename) |
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368 + (len ? len : strlen(cwd)) + 2); |
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369 if (!len) sprintf(rnext->str, "%s/%s", cwd, filename); |
16
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370 else { |
20
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371 char *res = rnext->str; |
16
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372 strncpy(res, path, len); |
20
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373 res += len; |
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374 *(res++) = '/'; |
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375 strcpy(res, filename); |
16
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376 } |
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377 |
20
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378 // Confirm it's not a directory. |
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379 if (!stat(rnext->str, &st) && S_ISREG(st.st_mode)) { |
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380 rnext->next = rlist; |
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381 rlist = rnext; |
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382 } else free(rnext); |
16
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383 |
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384 if (!next) break; |
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385 path += len; |
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Add xabspath(), is_file_type(), which_in_path(), and find_in_path().
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386 path++; |
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Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path().
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387 } |
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388 free(cwd); |
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389 |
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390 return rlist; |
4
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391 } |
7
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392 |
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393 // Convert unsigned int to ascii, writing into supplied buffer. A truncated |
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394 // result contains the first few digits of the result ala strncpy, and is |
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395 // always null terminated (unless buflen is 0). |
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396 void utoa_to_buf(unsigned n, char *buf, unsigned buflen) |
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397 { |
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398 int i, out = 0; |
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399 |
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400 if (buflen) { |
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401 for (i=1000000000; i; i/=10) { |
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402 int res = n/i; |
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403 |
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404 if ((res || out || i == 1) && --buflen>0) { |
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405 out++; |
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406 n -= res*i; |
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407 *buf++ = '0' + res; |
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408 } |
fc9c0503d5e2
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409 } |
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Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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410 *buf = 0; |
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411 } |
fc9c0503d5e2
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412 } |
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Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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413 |
fc9c0503d5e2
Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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414 // Convert signed integer to ascii, using utoa_to_buf() |
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415 void itoa_to_buf(int n, char *buf, unsigned buflen) |
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416 { |
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417 if (buflen && n<0) { |
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418 n = -n; |
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419 *buf++ = '-'; |
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420 buflen--; |
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421 } |
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Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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422 utoa_to_buf((unsigned)n, buf, buflen); |
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423 } |
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424 |
fc9c0503d5e2
Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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425 // This static buffer is used by both utoa() and itoa(), calling either one a |
fc9c0503d5e2
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426 // second time will overwrite the previous results. |
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|
427 // |
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428 // The longest 32 bit integer is -2 billion plus a null terminator: 12 bytes. |
fc9c0503d5e2
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429 // Note that int is always 32 bits on any remotely unix-like system, see |
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Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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430 // http://www.unix.org/whitepapers/64bit.html for details. |
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431 |
fc9c0503d5e2
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432 static char itoa_buf[12]; |
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|
433 |
fc9c0503d5e2
Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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434 // Convert unsigned integer to ascii, returning a static buffer. |
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Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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|
435 char *utoa(unsigned n) |
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Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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436 { |
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437 utoa_to_buf(n, itoa_buf, sizeof(itoa_buf)); |
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|
438 |
fc9c0503d5e2
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|
439 return itoa_buf; |
fc9c0503d5e2
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|
440 } |
fc9c0503d5e2
Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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|
441 |
fc9c0503d5e2
Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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|
442 char *itoa(int n) |
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Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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|
443 { |
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Implement df. Add -Wall to build and fix up warnings. Add copyright notices.
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444 itoa_to_buf(n, itoa_buf, sizeof(itoa_buf)); |
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|
445 |
fc9c0503d5e2
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|
446 return itoa_buf; |
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447 } |
53
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
448 |
102
aa4fa2543a65
Add atolx() which understands extensions for kilobytes and megabytes and such.
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449 // atol() with the kilo/mega/giga/tera/peta/exa extensions. |
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Add atolx() which understands extensions for kilobytes and megabytes and such.
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450 // (zetta and yotta don't fit in 64 bits.) |
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Add atolx() which understands extensions for kilobytes and megabytes and such.
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|
451 long atolx(char *c) |
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Add atolx() which understands extensions for kilobytes and megabytes and such.
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452 { |
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Add atolx() which understands extensions for kilobytes and megabytes and such.
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|
453 char *suffixes="kmgtpe", *end; |
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Add atolx() which understands extensions for kilobytes and megabytes and such.
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|
454 long val = strtol(c, &c, 0); |
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Add atolx() which understands extensions for kilobytes and megabytes and such.
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455 |
149
58554af48c8b
Fix from Charlie Shepherd: at end of string, don't match the null terminator
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|
456 if (*c) { |
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Fix from Charlie Shepherd: at end of string, don't match the null terminator
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|
457 end = strchr(suffixes, tolower(*c)); |
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Fix from Charlie Shepherd: at end of string, don't match the null terminator
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458 if (end) val *= 1024L<<((end-suffixes)*10); |
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459 } |
102
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460 return val; |
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461 } |
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Add atolx() which understands extensions for kilobytes and megabytes and such.
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462 |
53
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
463 // Return how long the file at fd is, if there's any way to determine it. |
41d55b5d49fd
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|
464 off_t fdlength(int fd) |
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
465 { |
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|
466 off_t bottom = 0, top = 0, pos; |
75
89ca591a9236
More random progress on mke2fs. Nothing to see yet.
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|
467 int size; |
53
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
468 |
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
469 // If the ioctl works for this, return it. |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
470 |
75
89ca591a9236
More random progress on mke2fs. Nothing to see yet.
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471 if (ioctl(fd, BLKGETSIZE, &size) >= 0) return size*512L; |
53
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472 |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
473 // If not, do a binary search for the last location we can read. (Some |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
474 // block devices don't do BLKGETSIZE right.) This should probably have |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
475 // a CONFIG option... |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
476 |
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
477 do { |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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52
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|
478 char temp; |
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479 |
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480 pos = bottom + (top - bottom) / 2; |
41d55b5d49fd
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|
481 |
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
482 // If we can read from the current location, it's bigger. |
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483 |
77
8018c40605d9
The fdlength() ioctl apparently doesn't work on files (and the lseek trick
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484 if (lseek(fd, pos, 0)>=0 && read(fd, &temp, 1)==1) { |
53
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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485 if (bottom == top) bottom = top = (top+1) * 2; |
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486 else bottom = pos; |
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|
487 |
41d55b5d49fd
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488 // If we can't, it's smaller. |
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489 |
41d55b5d49fd
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490 } else { |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
491 if (bottom == top) { |
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492 if (!top) return 0; |
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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493 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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494 } else top = pos; |
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495 } |
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496 } while (bottom + 1 != top); |
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497 |
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498 return pos + 1; |
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
499 } |
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|
500 |
115
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Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
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501 // This can return null (meaning file not found). It just won't return null |
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502 // for memory allocation reasons. |
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|
503 char *xreadlink(char *name) |
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504 { |
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505 int len, size = 0; |
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506 char *buf = 0; |
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Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
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507 |
19b5567f0a1b
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|
508 // Grow by 64 byte chunks until it's big enough. |
19b5567f0a1b
Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
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509 for(;;) { |
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Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
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|
510 size +=64; |
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diff
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511 buf = xrealloc(buf, size); |
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Rob Landley <rob@landley.net>
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512 len = readlink(name, buf, size); |
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513 |
19b5567f0a1b
Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
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|
514 if (len<0) { |
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515 free(buf); |
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Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
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516 return 0; |
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|
517 } |
19b5567f0a1b
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|
518 if (len<size) { |
19b5567f0a1b
Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
Rob Landley <rob@landley.net>
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102
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|
519 buf[len]=0; |
19b5567f0a1b
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|
520 return buf; |
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|
521 } |
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Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
Rob Landley <rob@landley.net>
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|
522 } |
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Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
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|
523 } |
19b5567f0a1b
Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
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parents:
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diff
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|
524 |
77
8018c40605d9
The fdlength() ioctl apparently doesn't work on files (and the lseek trick
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75
diff
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|
525 /* |
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The fdlength() ioctl apparently doesn't work on files (and the lseek trick
Rob Landley <rob@landley.net>
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75
diff
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|
526 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>
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diff
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|
527 |
53
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diff
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|
528 // 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
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|
529 char *readfile(char *name) |
41d55b5d49fd
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|
530 { |
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
531 off_t len; |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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52
diff
changeset
|
532 int fd; |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
533 char *buf; |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
534 |
156
1e8f4b05cb65
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|
535 fd = open(name, O_RDONLY); |
53
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
536 if (fd == -1) return 0; |
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
537 len = fdlength(fd); |
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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|
538 buf = xmalloc(len+1); |
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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52
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|
539 buf[xread(fd, buf, len)] = 0; |
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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|
540 |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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diff
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|
541 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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|
542 } |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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52
diff
changeset
|
543 |
41d55b5d49fd
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52
diff
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|
544 char *xreadfile(char *name) |
41d55b5d49fd
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Rob Landley <rob@landley.net>
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|
545 { |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
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|
546 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
|
547 if (!buf) perror_exit("xreadfile %s", name); |
53
41d55b5d49fd
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Rob Landley <rob@landley.net>
parents:
52
diff
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|
548 return buf; |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
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diff
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|
549 } |
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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|
550 |
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
|
551 */ |
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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|
552 |
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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|
553 // 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
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|
554 // 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
|
555 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
|
556 { |
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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|
557 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>
parents:
52
diff
changeset
|
558 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
|
559 pid_t pid; |
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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|
560 |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
561 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>
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52
diff
changeset
|
562 // 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
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|
563 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
|
564 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
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|
565 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
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|
566 |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
567 // 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
|
568 fd = open(pidfile, O_RDONLY); |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
569 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
|
570 |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
571 // Is the old program still there? |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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parents:
52
diff
changeset
|
572 spid[xread(fd, spid, sizeof(spid)-1)] = 0; |
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
|
573 close(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
|
574 pid = atoi(spid); |
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 if (fd < 1 || kill(pid, 0) == ESRCH) unlink(pidfile); |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
Rob Landley <rob@landley.net>
parents:
52
diff
changeset
|
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 // An else with more sanity checking might be nice here. |
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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|
578 } |
156
1e8f4b05cb65
Remove trailing whitespace (thanks to Charlie Shepherd), and a couple comment
Rob Landley <rob@landley.net>
parents:
153
diff
changeset
|
579 |
53
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 if (i == 3) error_exit("xpidfile %s", 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
|
581 |
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 xwrite(fd, spid, sprintf(spid, "%ld\n", (long)getpid())); |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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52
diff
changeset
|
583 close(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
|
584 } |
185
29e2051296fd
Add loopfiles() function, make catv use it.
Rob Landley <rob@landley.net>
parents:
167
diff
changeset
|
585 |
29e2051296fd
Add loopfiles() function, make catv use it.
Rob Landley <rob@landley.net>
parents:
167
diff
changeset
|
586 // Iterate through an array of files, opening each one (read only) and |
29e2051296fd
Add loopfiles() function, make catv use it.
Rob Landley <rob@landley.net>
parents:
167
diff
changeset
|
587 // calling a function on that filehandle and name. The special filename |
29e2051296fd
Add loopfiles() function, make catv use it.
Rob Landley <rob@landley.net>
parents:
167
diff
changeset
|
588 // "-" means stdin. An empty argument list calls function() on stdin. |
29e2051296fd
Add loopfiles() function, make catv use it.
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589 void loopfiles(char **argv, void (*function)(int fd, char *name)) |
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590 { |
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591 int fd; |
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592 |
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593 // If no arguments, read from stdin. |
187
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594 if (!*argv) function(0, "-"); |
185
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595 else do { |
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596 // Filename "-" means read from stdin. |
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597 // Inability to open a file prints a warning, but doesn't exit. |
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598 |
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599 if (!strcmp(*argv,"-")) fd=0; |
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600 else if (0>(fd = open(*argv, O_RDONLY))) { |
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601 perror_msg("%s",*argv); |
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602 toys.exitval = 1; |
220
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603 continue; |
185
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604 } |
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605 function(fd, *argv); |
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606 close(fd); |
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607 } while (*++argv); |
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608 } |
201
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609 |
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610 // Slow, but small. |
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611 |
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612 char *get_rawline(int fd, long *plen) |
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613 { |
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614 char c, *buf = NULL; |
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615 long len = 0; |
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616 |
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617 for (;;) { |
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618 if (1>read(fd, &c, 1)) break; |
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619 if (!(len & 63)) buf=xrealloc(buf, len+64); |
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620 if ((buf[len++]=c) == '\n') break; |
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621 } |
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622 if (buf) buf[len]=0; |
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623 if (plen) *plen = len; |
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624 |
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625 return buf; |
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626 } |
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627 |
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628 char *get_line(int fd) |
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629 { |
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630 long len; |
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631 char *buf = get_rawline(fd, &len); |
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632 |
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633 if (buf && buf[--len]=='\n') buf[len]=0; |
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634 |
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635 return buf; |
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636 } |
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637 |
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638 // Copy the rest of in to out and close both files. |
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639 |
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640 void xsendfile(int in, int out) |
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641 { |
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642 long len; |
209 | 643 char buf[4096]; |
201
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644 |
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645 if (in<0) return; |
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646 for (;;) { |
209 | 647 len = xread(in, buf, 4096); |
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648 if (len<1) break; |
209 | 649 xwrite(out, buf, len); |
201
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650 } |
209 | 651 } |
652 | |
653 // Open a temporary file to copy an existing file into. | |
654 int copy_tempfile(int fdin, char *name, char **tempname) | |
655 { | |
656 struct stat statbuf; | |
657 int fd; | |
658 | |
659 *tempname = xstrndup(name, strlen(name)+6); | |
660 strcat(*tempname,"XXXXXX"); | |
661 if(-1 == (fd = mkstemp(*tempname))) error_exit("no temp file"); | |
662 | |
663 // Set permissions of output file | |
664 | |
665 fstat(fdin, &statbuf); | |
666 fchmod(fd, statbuf.st_mode); | |
667 | |
668 return fd; | |
201
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669 } |
209 | 670 |
671 // Abort the copy and delete the temporary file. | |
672 void delete_tempfile(int fdin, int fdout, char **tempname) | |
673 { | |
674 close(fdin); | |
675 close(fdout); | |
676 unlink(*tempname); | |
677 free(*tempname); | |
678 *tempname = NULL; | |
679 } | |
680 | |
681 // Copy the rest of the data and replace the original with the copy. | |
682 void replace_tempfile(int fdin, int fdout, char **tempname) | |
683 { | |
684 char *temp = xstrdup(*tempname); | |
685 | |
686 temp[strlen(temp)-6]=0; | |
687 if (fdin != -1) { | |
688 xsendfile(fdin, fdout); | |
689 xclose(fdin); | |
690 } | |
691 xclose(fdout); | |
692 rename(*tempname, temp); | |
693 free(*tempname); | |
694 free(temp); | |
695 *tempname = NULL; | |
696 } |