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annotate util.c @ 496:6fc71114d145

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Extract function to determine executable directory from load_config so it can be used elsewhere
author Mike Pavone <pavone@retrodev.com>
date Mon, 28 Oct 2013 21:48:46 -0700
parents 39cad98d2789
children 32da1e0d5e55
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
495
39cad98d2789 Allow OpenGL support to be disabled at compile time. Move generic utility functions out of config.c
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diff changeset
1 #include <string.h>
39cad98d2789 Allow OpenGL support to be disabled at compile time. Move generic utility functions out of config.c
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2 #include <stdlib.h>
39cad98d2789 Allow OpenGL support to be disabled at compile time. Move generic utility functions out of config.c
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3 #include <stdio.h>
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4 #include <ctype.h>
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5
496
6fc71114d145 Extract function to determine executable directory from load_config so it can be used elsewhere
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6 #include <sys/types.h>
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7 #include <sys/stat.h>
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8 #include <unistd.h>
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9
495
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10 char * alloc_concat(char * first, char * second)
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11 {
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12 int flen = strlen(first);
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13 int slen = strlen(second);
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14 char * ret = malloc(flen + slen + 1);
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15 memcpy(ret, first, flen);
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16 memcpy(ret+flen, second, slen+1);
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17 return ret;
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18 }
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19
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20 char * alloc_concat_m(int num_parts, char ** parts)
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21 {
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22 int total = 0;
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23 for (int i = 0; i < num_parts; i++) {
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24 total += strlen(parts[i]);
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25 }
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26 char * ret = malloc(total + 1);
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27 *ret = 0;
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28 for (int i = 0; i < num_parts; i++) {
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29 strcat(ret, parts[i]);
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30 }
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31 return ret;
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32 }
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33
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34 long file_size(FILE * f)
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35 {
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36 fseek(f, 0, SEEK_END);
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37 long fsize = ftell(f);
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38 fseek(f, 0, SEEK_SET);
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39 return fsize;
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40 }
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41
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42 char * strip_ws(char * text)
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43 {
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44 while (*text && (!isprint(*text) || isblank(*text)))
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45 {
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46 text++;
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47 }
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48 char * ret = text;
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49 text = ret + strlen(ret) - 1;
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50 while (text > ret && (!isprint(*text) || isblank(*text)))
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51 {
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52 *text = 0;
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53 text--;
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54 }
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55 return ret;
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56 }
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57
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58 char * split_keyval(char * text)
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59 {
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60 while (*text && !isblank(*text))
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61 {
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62 text++;
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63 }
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64 if (!*text) {
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65 return text;
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66 }
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67 *text = 0;
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68 return text+1;
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69 }
496
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70
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71 static char * exe_str;
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72
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73 void set_exe_str(char * str)
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74 {
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75 exe_str = str;
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76 }
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77
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78 char * readlink_alloc(char * path)
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79 {
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80 char * linktext = NULL;
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81 ssize_t linksize = 512;
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82 ssize_t cursize = 0;
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83 do {
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84 if (linksize > cursize) {
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85 cursize = linksize;
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86 if (linktext) {
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87 free(linktext);
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88 }
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89 }
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90 linktext = malloc(cursize);
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91 linksize = readlink(path, linktext, cursize-1);
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92 if (linksize == -1) {
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93 perror("readlink");
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94 free(linktext);
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95 linktext = NULL;
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96 }
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97 } while (linksize > cursize);
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98 return linktext;
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99 }
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100
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101 char * get_exe_dir()
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102 {
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103 static char * exe_dir;
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104 if (!exe_dir) {
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105 char * linktext = readlink_alloc("/proc/self/exe");
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106 if (!linktext) {
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107 goto fallback;
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108 }
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109 char * cur;
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110 int linksize = strlen(linktext);
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111 for(cur = linktext + linksize - 1; cur != linktext; cur--)
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112 {
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113 if (*cur == '/') {
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114 *cur = 0;
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115 break;
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116 }
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117 }
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118 if (cur == linktext) {
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119 free(linktext);
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120 fallback:
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121 if (!exe_str) {
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122 fputs("/proc/self/exe is not available and set_exe_str was not called!", stderr);
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123 }
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124 int pathsize = strlen(exe_str);
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125 for(cur = exe_str + pathsize - 1; cur != exe_str; cur--)
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126 {
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127 if (*cur == '/') {
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128 exe_dir = malloc(cur-exe_str+1);
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129 memcpy(exe_dir, exe_str, cur-exe_str);
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130 exe_dir[cur-exe_str] = 0;
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131 break;
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132 }
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133 }
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134 } else {
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135 exe_dir = linktext;
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136 }
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137 }
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138 return exe_dir;
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139 }