Mercurial > hg > toybox
annotate lib/lib.c @ 149:58554af48c8b
Fix from Charlie Shepherd: at end of string, don't match the null terminator
as a yottabyte suffix. Also, the shift increment needs to be a long constant
on 64-bit platforms for the top three suffixes to mean anything.
author | Rob Landley <rob@landley.net> |
---|---|
date | Sun, 04 Nov 2007 15:32:59 -0600 |
parents | 88dd003ccdf4 |
children | 5f206fe8d965 |
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 * |
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 |
137
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More klibc fixes from Maximilian Attems, strlcpy() this time.
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14 #if !defined(__UCLIBC__) && !defined(__KLIBC__) |
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15 |
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16 // uClibc has this, and if we define our own it conflicts. |
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17 |
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18 // Like strncpy but always null terminated. |
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19 void strlcpy(char *dest, char *src, size_t size) |
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20 { |
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21 strncpy(dest,src,size); |
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22 dest[size-1] = 0; |
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23 } |
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24 #endif |
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25 |
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26 |
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27 void verror_msg(char *msg, int err, va_list va) |
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28 { |
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29 fprintf(stderr, "%s: ", toys.which->name); |
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30 vfprintf(stderr, msg, va); |
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31 if (err) fprintf(stderr, ": %s", strerror(err)); |
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32 putc('\n', stderr); |
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33 } |
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34 |
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35 void error_msg(char *msg, ...) |
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36 { |
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37 va_list va; |
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38 |
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39 va_start(va, msg); |
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40 verror_msg(msg, 0, va); |
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41 va_end(va); |
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42 } |
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43 |
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44 void perror_msg(char *msg, ...) |
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45 { |
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46 va_list va; |
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47 |
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48 va_start(va, msg); |
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49 verror_msg(msg, errno, va); |
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50 va_end(va); |
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51 } |
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52 |
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53 // Die with an error message. |
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54 void error_exit(char *msg, ...) |
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55 { |
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56 va_list va; |
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57 |
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58 if (CFG_HELP && toys.exithelp) { |
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59 *toys.optargs=*toys.argv; |
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60 help_main(); |
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61 fprintf(stderr,"\n"); |
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62 } |
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63 |
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64 va_start(va, msg); |
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65 verror_msg(msg, 0, va); |
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66 va_end(va); |
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67 |
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68 exit(toys.exitval); |
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69 } |
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70 |
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71 |
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72 // Die with an error message and strerror(errno) |
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73 void perror_exit(char *msg, ...) |
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74 { |
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75 va_list va; |
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76 |
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77 va_start(va, msg); |
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78 verror_msg(msg, errno, va); |
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79 va_end(va); |
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80 |
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81 exit(toys.exitval); |
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82 } |
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83 |
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84 // Die unless we can allocate memory. |
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85 void *xmalloc(size_t size) |
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86 { |
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87 void *ret = malloc(size); |
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88 if (!ret) error_exit("xmalloc"); |
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89 |
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90 return ret; |
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91 } |
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92 |
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93 // Die unless we can allocate prezeroed memory. |
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94 void *xzalloc(size_t size) |
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95 { |
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96 void *ret = xmalloc(size); |
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97 bzero(ret,size); |
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98 return ret; |
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99 } |
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100 |
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101 // Die unless we can change the size of an existing allocation, possibly |
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102 // moving it. (Notice different arguments from libc function.) |
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103 void *xrealloc(void *ptr, size_t size) |
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104 { |
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105 ptr = realloc(ptr, size); |
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106 if (!ptr) error_exit("xrealloc"); |
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107 |
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108 return ptr; |
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109 } |
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110 |
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111 // Die unless we can allocate a copy of this many bytes of string. |
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112 void *xstrndup(char *s, size_t n) |
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113 { |
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114 void *ret = xmalloc(++n); |
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115 strlcpy(ret, s, n); |
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116 |
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117 return ret; |
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118 } |
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119 |
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120 // Die unless we can allocate a copy of this string. |
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121 void *xstrdup(char *s) |
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122 { |
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123 return xstrndup(s,strlen(s)); |
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124 } |
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125 |
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126 // Die unless we can allocate enough space to sprintf() into. |
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127 char *xmsprintf(char *format, ...) |
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128 { |
126
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129 va_list va, va2; |
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130 int len; |
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131 char *ret; |
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132 |
126
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133 va_start(va, format); |
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134 va_copy(va2, va); |
4
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135 |
126
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136 // How long is it? |
4
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137 len = vsnprintf(0, 0, format, va); |
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138 len++; |
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139 va_end(va); |
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140 |
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141 // Allocate and do the sprintf() |
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142 ret = xmalloc(len); |
126
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143 vsnprintf(ret, len, format, va2); |
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144 va_end(va2); |
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145 |
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146 return ret; |
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147 } |
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148 |
70
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149 void xprintf(char *format, ...) |
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150 { |
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151 va_list va; |
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152 va_start(va, format); |
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153 |
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154 vprintf(format, va); |
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155 if (ferror(stdout)) perror_exit("write"); |
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156 } |
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157 |
128
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158 void xputs(char *s) |
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159 { |
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160 if (EOF == puts(s)) perror_exit("write"); |
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161 } |
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162 |
70
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163 void xputc(char c) |
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164 { |
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165 if (EOF == fputc(c, stdout)) perror_exit("write"); |
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166 } |
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167 |
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168 void xflush(void) |
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169 { |
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170 if (fflush(stdout)) perror_exit("write");; |
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171 } |
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172 |
3
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173 // Die unless we can exec argv[] (or run builtin command). Note that anything |
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174 // 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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175 void xexec(char **argv) |
2
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176 { |
3
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177 toy_exec(argv); |
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178 execvp(argv[0], argv); |
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179 error_exit("No %s", argv[0]); |
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180 } |
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181 |
51 | 182 void xaccess(char *path, int flags) |
183 { | |
70
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184 if (access(path, flags)) perror_exit("Can't access '%s'\n", path); |
51 | 185 } |
186 | |
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187 // Die unless we can open/create a file, returning file descriptor. |
49
bb4c38853a7d
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188 int xcreate(char *path, int flags, int mode) |
2
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189 { |
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Infrastructure, first drop of toy shell, and a bit of work on df.
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190 int fd = open(path, flags, mode); |
148
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xcreate(): perror already prints error name and newline, remove redundancy.
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191 if (fd == -1) perror_exit("%s", path); |
2
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192 return fd; |
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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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194 |
49
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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 |
2
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201 // Die unless we can open/create a file, returning FILE *. |
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202 FILE *xfopen(char *path, char *mode) |
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203 { |
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204 FILE *f = fopen(path, mode); |
70
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205 if (!f) perror_exit("No file %s\n", path); |
2
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206 return f; |
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Infrastructure, first drop of toy shell, and a bit of work on df.
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|
207 } |
4
732b055e17f7
Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path().
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208 |
63
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209 // Keep reading until full or EOF |
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|
210 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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211 { |
63
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|
212 size_t count = 0; |
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|
213 while (count<len) { |
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|
214 int i = read(fd, buf+count, len-count); |
8
04f66da2bdbf
Add reread(), readall(), and xread() on the bus ride in to work...
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|
215 if (!i) return len; |
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Add reread(), readall(), and xread() on the bus ride in to work...
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216 if (i<0) return i; |
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Add reread(), readall(), and xread() on the bus ride in to work...
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217 count += i; |
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218 } |
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219 |
04f66da2bdbf
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220 return count; |
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221 } |
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222 |
50
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|
223 // Keep writing until done or EOF |
63
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224 ssize_t writeall(int fd, void *buf, size_t len) |
50
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225 { |
63
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|
226 size_t count = 0; |
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227 while (count<len) { |
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228 int i = write(fd, buf+count, len-count); |
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229 if (i<1) return i; |
50
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230 count += i; |
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Add rewrite(), writeall(),and xwrite() to match the read versions.
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|
231 } |
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232 |
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233 return count; |
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234 } |
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235 |
53
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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236 // Die if there's an error other than EOF. |
63
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237 size_t xread(int fd, void *buf, size_t len) |
8
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238 { |
63
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239 len = read(fd, buf, len); |
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240 if (len < 0) perror_exit("xread"); |
53
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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241 |
63
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242 return len; |
53
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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243 } |
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244 |
63
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245 void xreadall(int fd, void *buf, size_t len) |
53
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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246 { |
63
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247 if (len != readall(fd, buf, len)) perror_exit("xreadall"); |
53
41d55b5d49fd
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248 } |
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249 |
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250 // There's no xwriteall(), just xwrite(). When we read, there may or may not |
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251 // be more data waiting. When we write, there is data and it had better go |
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252 // somewhere. |
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253 |
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254 void xwrite(int fd, void *buf, size_t len) |
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255 { |
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256 if (len != writeall(fd, buf, len)) perror_exit("xwrite"); |
50
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257 } |
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258 |
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259 char *xgetcwd(void) |
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260 { |
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261 char *buf = getcwd(NULL, 0); |
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262 if (!buf) perror_exit("xgetcwd"); |
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263 |
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264 return buf; |
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265 } |
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266 |
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267 void xstat(char *path, struct stat *st) |
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268 { |
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269 if(stat(path, st)) perror_exit("Can't stat %s\n",path); |
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270 } |
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271 |
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272 // Cannonicalizes path by removing ".", "..", and "//" elements. This is not |
44 | 273 // the same as realpath(), where "dir/.." could wind up somewhere else by |
274 // following symlinks. | |
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275 char *xabspath(char *path) |
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276 { |
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277 char *from, *to; |
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278 |
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279 // If this isn't an absolute path, make it one with cwd. |
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280 if (path[0]!='/') { |
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281 char *cwd=xgetcwd(); |
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282 path = xmsprintf("%s/%s",cwd,path); |
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283 free(cwd); |
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284 } else path = xstrdup(path); |
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285 |
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286 // Loop through path elements |
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287 from = to = path; |
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288 while (*from) { |
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289 |
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290 // Continue any current path component. |
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291 if (*from!='/') { |
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292 *(to++) = *(from++); |
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293 continue; |
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294 } |
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295 |
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296 // Skip duplicate slashes. |
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297 while (*from=='/') from++; |
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298 |
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299 // Start of a new filename. Handle . and .. |
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300 while (*from=='.') { |
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301 // Skip . |
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302 if (from[1]=='/') from += 2; |
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303 else if (!from[1]) from++; |
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304 // Back up for .. |
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305 else if (from[1]=='.') { |
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306 if (from[2]=='/') from +=3; |
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307 else if(!from[2]) from+=2; |
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308 else break; |
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309 while (to>path && *(--to)!='/'); |
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310 } else break; |
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311 } |
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312 // Add directory separator slash. |
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313 *(to++) = '/'; |
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314 } |
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315 *to = 0; |
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316 |
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317 return path; |
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318 } |
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319 |
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320 // Find all file in a colon-separated path with access type "type" (generally |
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321 // X_OK or R_OK). Returns a list of absolute paths to each file found, in |
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322 // order. |
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323 |
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324 struct string_list *find_in_path(char *path, char *filename) |
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325 { |
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326 struct string_list *rlist = NULL; |
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327 char *cwd = xgetcwd(); |
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328 |
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329 for (;;) { |
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330 char *next = path ? index(path, ':') : NULL; |
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331 int len = next ? next-path : strlen(path); |
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332 struct string_list *rnext; |
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333 struct stat st; |
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334 |
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335 rnext = xmalloc(sizeof(void *) + strlen(filename) |
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336 + (len ? len : strlen(cwd)) + 2); |
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337 if (!len) sprintf(rnext->str, "%s/%s", cwd, filename); |
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338 else { |
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339 char *res = rnext->str; |
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340 strncpy(res, path, len); |
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341 res += len; |
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342 *(res++) = '/'; |
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343 strcpy(res, filename); |
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344 } |
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345 |
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346 // Confirm it's not a directory. |
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347 if (!stat(rnext->str, &st) && S_ISREG(st.st_mode)) { |
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348 rnext->next = rlist; |
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349 rlist = rnext; |
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350 } else free(rnext); |
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351 |
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352 if (!next) break; |
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353 path += len; |
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354 path++; |
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355 } |
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356 free(cwd); |
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357 |
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358 return rlist; |
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359 |
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360 } |
7
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361 |
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362 // Convert unsigned int to ascii, writing into supplied buffer. A truncated |
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363 // result contains the first few digits of the result ala strncpy, and is |
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364 // always null terminated (unless buflen is 0). |
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365 void utoa_to_buf(unsigned n, char *buf, unsigned buflen) |
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366 { |
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367 int i, out = 0; |
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368 |
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369 if (buflen) { |
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370 for (i=1000000000; i; i/=10) { |
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371 int res = n/i; |
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372 |
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373 if ((res || out || i == 1) && --buflen>0) { |
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374 out++; |
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375 n -= res*i; |
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376 *buf++ = '0' + res; |
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377 } |
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378 } |
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379 *buf = 0; |
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380 } |
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381 } |
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382 |
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383 // Convert signed integer to ascii, using utoa_to_buf() |
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384 void itoa_to_buf(int n, char *buf, unsigned buflen) |
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385 { |
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386 if (buflen && n<0) { |
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387 n = -n; |
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388 *buf++ = '-'; |
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389 buflen--; |
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390 } |
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391 utoa_to_buf((unsigned)n, buf, buflen); |
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392 } |
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393 |
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394 // This static buffer is used by both utoa() and itoa(), calling either one a |
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395 // second time will overwrite the previous results. |
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396 // |
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397 // The longest 32 bit integer is -2 billion plus a null terminator: 12 bytes. |
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398 // Note that int is always 32 bits on any remotely unix-like system, see |
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399 // http://www.unix.org/whitepapers/64bit.html for details. |
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400 |
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401 static char itoa_buf[12]; |
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402 |
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403 // Convert unsigned integer to ascii, returning a static buffer. |
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404 char *utoa(unsigned n) |
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405 { |
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406 utoa_to_buf(n, itoa_buf, sizeof(itoa_buf)); |
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407 |
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408 return itoa_buf; |
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409 } |
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410 |
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411 char *itoa(int n) |
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412 { |
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413 itoa_to_buf(n, itoa_buf, sizeof(itoa_buf)); |
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414 |
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415 return itoa_buf; |
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416 } |
53
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417 |
102
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418 // atol() with the kilo/mega/giga/tera/peta/exa extensions. |
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419 // (zetta and yotta don't fit in 64 bits.) |
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420 long atolx(char *c) |
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421 { |
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422 char *suffixes="kmgtpe", *end; |
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423 long val = strtol(c, &c, 0); |
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424 |
149
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Fix from Charlie Shepherd: at end of string, don't match the null terminator
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425 if (*c) { |
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426 end = strchr(suffixes, tolower(*c)); |
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427 if (end) val *= 1024L<<((end-suffixes)*10); |
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428 } |
102
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429 return val; |
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430 } |
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431 |
53
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432 // Return how long the file at fd is, if there's any way to determine it. |
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433 off_t fdlength(int fd) |
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434 { |
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|
435 off_t bottom = 0, top = 0, pos; |
75
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More random progress on mke2fs. Nothing to see yet.
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|
436 int size; |
53
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|
437 |
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
438 // 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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439 |
75
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440 if (ioctl(fd, BLKGETSIZE, &size) >= 0) return size*512L; |
53
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441 |
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|
442 // If not, do a binary search for the last location we can read. (Some |
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
443 // block devices don't do BLKGETSIZE right.) This should probably have |
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
444 // a CONFIG option... |
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445 |
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|
446 do { |
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447 char temp; |
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|
448 |
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449 pos = bottom + (top - bottom) / 2; |
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|
450 |
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
451 // If we can read from the current location, it's bigger. |
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
452 |
77
8018c40605d9
The fdlength() ioctl apparently doesn't work on files (and the lseek trick
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|
453 if (lseek(fd, pos, 0)>=0 && read(fd, &temp, 1)==1) { |
53
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454 if (bottom == top) bottom = top = (top+1) * 2; |
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455 else bottom = pos; |
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|
456 |
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|
457 // If we can't, it's smaller. |
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|
458 |
41d55b5d49fd
Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
459 } else { |
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|
460 if (bottom == top) { |
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
461 if (!top) return 0; |
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|
462 bottom = top/2; |
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463 } else top = pos; |
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|
464 } |
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Add start of mke2fs/gene2fs, and some other stuff I've been working on.
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|
465 } while (bottom + 1 != top); |
41d55b5d49fd
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466 |
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467 return pos + 1; |
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468 } |
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|
469 |
115
19b5567f0a1b
Add readlink, xreadlink(), and change xrealloc() to not fight the stupid
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470 // This can return null (meaning file not found). It just won't return null |
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471 // for memory allocation reasons. |
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472 char *xreadlink(char *name) |
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473 { |
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474 int len, size = 0; |
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|
475 char *buf = 0; |
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476 |
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477 // Grow by 64 byte chunks until it's big enough. |
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478 for(;;) { |
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479 size +=64; |
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480 buf = xrealloc(buf, size); |
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481 len = readlink(name, buf, size); |
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482 |
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483 if (len<0) { |
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484 free(buf); |
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485 return 0; |
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486 } |
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487 if (len<size) { |
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488 buf[len]=0; |
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489 return buf; |
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490 } |
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491 } |
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492 } |
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493 |
77
8018c40605d9
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494 /* |
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495 This might be of use or might not. Unknown yet... |
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496 |
53
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497 // Read contents of file as a single freshly allocated nul-terminated string. |
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498 char *readfile(char *name) |
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499 { |
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500 off_t len; |
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501 int fd; |
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502 char *buf; |
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503 |
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504 fd = open(pidfile, O_RDONLY); |
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505 if (fd == -1) return 0; |
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506 len = fdlength(fd); |
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507 buf = xmalloc(len+1); |
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508 buf[xread(fd, buf, len)] = 0; |
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509 |
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510 return buf; |
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511 } |
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512 |
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513 char *xreadfile(char *name) |
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514 { |
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515 char *buf = readfile(name); |
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516 if (!buf) perror_exit("xreadfile %s", name); |
53
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517 return buf; |
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518 } |
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519 |
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520 */ |
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521 |
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522 // Open a /var/run/NAME.pid file, dying if we can't write it or if it currently |
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523 // exists and is this executable. |
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524 void xpidfile(char *name) |
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525 { |
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526 char pidfile[256], spid[32]; |
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527 int i, fd; |
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528 pid_t pid; |
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529 |
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530 sprintf(pidfile, "/var/run/%s.pid", name); |
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531 // Try three times to open the sucker. |
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532 for (i=0; i<3; i++) { |
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533 fd = open(pidfile, O_CREAT|O_EXCL, 0644); |
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534 if (fd != -1) break; |
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535 |
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536 // If it already existed, read it. Loop for race condition. |
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537 fd = open(pidfile, O_RDONLY); |
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538 if (fd == -1) continue; |
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539 |
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540 // Is the old program still there? |
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541 spid[xread(fd, spid, sizeof(spid)-1)] = 0; |
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542 close(fd); |
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543 pid = atoi(spid); |
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544 if (fd < 1 || kill(pid, 0) == ESRCH) unlink(pidfile); |
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545 |
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546 // An else with more sanity checking might be nice here. |
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547 } |
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548 |
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549 if (i == 3) error_exit("xpidfile %s", name); |
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550 |
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551 xwrite(fd, spid, sprintf(spid, "%ld\n", (long)getpid())); |
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552 close(fd); |
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553 } |