1 | /*
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2 | * Replacements for common but usually nonstandard functions that aren't
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3 | * supplied by all platforms.
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4 | *
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5 | * Copyright (C) 2009 by Dan Fandrich <dan@coneharvesters.com>, et. al.
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6 | *
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7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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8 | */
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9 | #include "libbb.h"
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10 |
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11 | #ifndef HAVE_STRCHRNUL
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12 | char* FAST_FUNC strchrnul(const char *s, int c)
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13 | {
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14 | while (*s != '\0' && *s != c)
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15 | s++;
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16 | return (char*)s;
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17 | }
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18 | #endif
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19 |
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20 | #ifndef HAVE_USLEEP
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21 | int FAST_FUNC usleep(unsigned usec)
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22 | {
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23 | struct timespec ts;
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24 | ts.tv_sec = usec / 1000000u;
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25 | ts.tv_nsec = (usec % 1000000u) * 1000u;
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26 | /*
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27 | * If a signal has non-default handler, nanosleep returns early.
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28 | * Our version of usleep doesn't return early
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29 | * if interrupted by such signals:
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30 | *
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31 | */
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32 | while (nanosleep(&ts, &ts) != 0)
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33 | continue;
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34 | return 0;
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35 | }
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36 | #endif
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37 |
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38 | #ifndef HAVE_VASPRINTF
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39 | int FAST_FUNC vasprintf(char **string_ptr, const char *format, va_list p)
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40 | {
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41 | int r;
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42 | va_list p2;
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43 | char buf[128];
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44 |
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45 | va_copy(p2, p);
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46 | r = vsnprintf(buf, 128, format, p);
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47 | va_end(p);
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48 |
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49 | /* Note: can't use xstrdup/xmalloc, they call vasprintf (us) on failure! */
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50 |
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51 | if (r < 128) {
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52 | va_end(p2);
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53 | *string_ptr = strdup(buf);
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54 | return (*string_ptr ? r : -1);
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55 | }
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56 |
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57 | *string_ptr = malloc(r+1);
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58 | r = (*string_ptr ? vsnprintf(*string_ptr, r+1, format, p2) : -1);
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59 | va_end(p2);
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60 |
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61 | return r;
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62 | }
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63 | #endif
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64 |
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65 | #ifndef HAVE_DPRINTF
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66 | /* dprintf is now part of POSIX.1, but was only added in 2008 */
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67 | int dprintf(int fd, const char *format, ...)
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68 | {
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69 | va_list p;
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70 | int r;
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71 | char *string_ptr;
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72 |
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73 | va_start(p, format);
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74 | r = vasprintf(&string_ptr, format, p);
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75 | va_end(p);
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76 | if (r >= 0) {
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77 | r = full_write(fd, string_ptr, r);
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78 | free(string_ptr);
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79 | }
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80 | return r;
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81 | }
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82 | #endif
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83 |
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84 | #ifndef HAVE_MEMRCHR
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85 | /* Copyright (C) 2005 Free Software Foundation, Inc.
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86 | * memrchr() is a GNU function that might not be available everywhere.
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87 | * It's basically the inverse of memchr() - search backwards in a
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88 | * memory block for a particular character.
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89 | */
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90 | void* FAST_FUNC memrchr(const void *s, int c, size_t n)
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91 | {
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92 | const char *start = s, *end = s;
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93 |
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94 | end += n - 1;
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95 |
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96 | while (end >= start) {
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97 | if (*end == (char)c)
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98 | return (void *) end;
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99 | end--;
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100 | }
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101 |
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102 | return NULL;
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103 | }
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104 | #endif
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105 |
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106 | #ifndef HAVE_MKDTEMP
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107 | /* This is now actually part of POSIX.1, but was only added in 2008 */
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108 | char* FAST_FUNC mkdtemp(char *template)
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109 | {
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110 | if (mktemp(template) == NULL || mkdir(template, 0700) != 0)
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111 | return NULL;
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112 | return template;
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113 | }
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114 | #endif
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115 |
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116 | #ifndef HAVE_STRCASESTR
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117 | /* Copyright (c) 1999, 2000 The ht://Dig Group */
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118 | char* FAST_FUNC strcasestr(const char *s, const char *pattern)
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119 | {
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120 | int length = strlen(pattern);
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121 |
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122 | while (*s) {
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123 | if (strncasecmp(s, pattern, length) == 0)
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124 | return (char *)s;
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125 | s++;
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126 | }
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127 | return 0;
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128 | }
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129 | #endif
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130 |
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131 | #ifndef HAVE_STRSEP
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132 | /* Copyright (C) 2004 Free Software Foundation, Inc. */
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133 | char* FAST_FUNC strsep(char **stringp, const char *delim)
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134 | {
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135 | char *start = *stringp;
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136 | char *ptr;
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137 |
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138 | if (!start)
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139 | return NULL;
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140 |
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141 | if (!*delim)
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142 | ptr = start + strlen(start);
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143 | else {
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144 | ptr = strpbrk(start, delim);
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145 | if (!ptr) {
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146 | *stringp = NULL;
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147 | return start;
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148 | }
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149 | }
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150 |
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151 | *ptr = '\0';
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152 | *stringp = ptr + 1;
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153 |
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154 | return start;
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155 | }
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156 | #endif
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157 |
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158 | #ifndef HAVE_STPCPY
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159 | char* FAST_FUNC stpcpy(char *p, const char *to_add)
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160 | {
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161 | while ((*p = *to_add) != '\0') {
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162 | p++;
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163 | to_add++;
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164 | }
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165 | return p;
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166 | }
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167 | #endif
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168 |
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169 | #ifndef HAVE_GETLINE
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170 | ssize_t FAST_FUNC getline(char **lineptr, size_t *n, FILE *stream)
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171 | {
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172 | int ch;
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173 | char *line = *lineptr;
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174 | size_t alloced = *n;
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175 | size_t len = 0;
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176 |
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177 | do {
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178 | ch = fgetc(stream);
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179 | if (ch == EOF)
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180 | break;
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181 | if (len + 1 >= alloced) {
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182 | alloced += alloced/4 + 64;
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183 | line = xrealloc(line, alloced);
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184 | }
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185 | line[len++] = ch;
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186 | } while (ch != '\n');
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187 |
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188 | if (len == 0)
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189 | return -1;
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190 |
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191 | line[len] = '\0';
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192 | *lineptr = line;
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193 | *n = alloced;
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194 | return len;
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195 | }
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196 | #endif
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197 |
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198 | #ifndef HAVE_TTYNAME_R
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199 | int ttyname_r(int fd, char *buf, size_t buflen)
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200 | {
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201 | int r;
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202 | char path[sizeof("/proc/self/fd/%d") + sizeof(int)*3];
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203 |
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204 | if (!isatty(fd))
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205 | return errno == EINVAL ? ENOTTY : errno;
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206 | sprintf(path, "/proc/self/fd/%d", fd);
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207 | r = readlink(path, buf, buflen);
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208 | if (r < 0)
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209 | return errno;
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210 | if (r >= buflen)
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211 | return ERANGE;
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212 | buf[r] = '\0';
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213 | return 0;
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214 | }
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215 | #endif
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