1 | /******************************************************************* |
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2 | * File: omFindExec.c |
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3 | * Purpose: routine which determines absolute pathname of executable |
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4 | * Author: obachman (Olaf Bachmann) |
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5 | * Created: 11/99 |
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6 | *******************************************************************/ |
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7 | |
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8 | #include "config.h" |
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9 | |
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10 | #if defined(HAVE_UNISTD_H) && defined(STDC_HEADERS) |
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11 | |
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12 | #ifdef HAVE_UNISTD_H |
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13 | #include <unistd.h> /* always defiend */ |
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14 | #endif |
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15 | |
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16 | #include <stdlib.h> |
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17 | #include <string.h> |
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18 | |
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19 | #include "omFindExec.h" |
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20 | |
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21 | #ifndef MAXPATHLEN |
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22 | #define MAXPATHLEN 1024 |
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23 | #endif |
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24 | |
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25 | /* ABSOLUTE_FILENAME_P (fname): True if fname is an absolute filename */ |
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26 | #define ABSOLUTE_FILENAME_P(fname) (fname[0] == '/') |
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27 | |
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28 | /* Return the absolute name of the program named NAME. This function |
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29 | searches the directories in the PATH environment variable if PROG |
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30 | has no directory components. */ |
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31 | #ifndef HAVE_READLINK |
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32 | char * omFindExec (const char *name, char* executable) |
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33 | #else |
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34 | static char * omFindExec_link (const char *name, char* executable) |
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35 | #endif |
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36 | { |
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37 | char *search; |
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38 | char *p; |
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39 | #ifdef WINNT |
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40 | char *extra = NULL; |
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41 | #endif |
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42 | char tbuf[MAXPATHLEN]; |
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43 | |
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44 | if (ABSOLUTE_FILENAME_P(name)) |
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45 | { |
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46 | /* If we can execute the named file then return it. */ |
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47 | if (! access (name, X_OK)) |
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48 | { |
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49 | strcpy(executable, name); |
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50 | #ifdef __CYGWIN__ |
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51 | strcat(executable, ".exe"); |
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52 | #endif |
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53 | return executable; |
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54 | } |
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55 | } |
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56 | else |
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57 | { |
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58 | if (((name[0] == '.') && (name[1] == '/')) || |
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59 | ((name[0] == '.') && (name[1] == '.') && (name[2] == '/')) || |
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60 | strchr(name, '/') != NULL) |
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61 | { |
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62 | |
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63 | #ifdef HAVE_GETCWD |
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64 | getcwd (tbuf, MAXPATHLEN); |
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65 | #else |
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66 | # ifdef HAVE_GETWD |
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67 | getwd (tbuf); |
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68 | # endif |
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69 | #endif |
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70 | strcat (tbuf, "/"); |
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71 | strcat (tbuf, name); |
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72 | if (! access(tbuf, X_OK)) |
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73 | { |
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74 | strcpy(executable, tbuf); |
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75 | #ifdef __CYGWIN__ |
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76 | strcat(executable, ".exe"); |
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77 | #endif |
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78 | return executable; |
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79 | } |
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80 | } |
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81 | |
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82 | |
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83 | search = getenv("PATH"); |
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84 | /* for winnt under msdos, cwd is implictly in the path */ |
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85 | #ifdef WINNT |
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86 | p = getenv("SHELL"); |
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87 | if (p == NULL || strlen(p) < 2) |
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88 | { |
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89 | char *extra = NULL; |
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90 | /* we are under msdos display */ |
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91 | extra = (char*) malloc((search != NULL ? strlen(search) : 0) + 3); |
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92 | strcpy(extra, ".:"); |
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93 | if (search != NULL) strcat(extra, search); |
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94 | search = extra; |
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95 | } |
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96 | #endif |
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97 | p = search; |
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98 | |
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99 | if (p != NULL) |
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100 | { |
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101 | while (1) |
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102 | { |
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103 | char *next; |
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104 | next = tbuf; |
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105 | |
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106 | /* Copy directory name into [tbuf]. */ |
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107 | /* This is somewhat tricky: empty names mean cwd, w.r.t. some |
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108 | shell spec */ |
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109 | while (*p && *p != ':') |
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110 | *next ++ = *p ++; |
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111 | *next = '\0'; |
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112 | |
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113 | if ((tbuf[0] == '.' && tbuf[1] == '\0') || tbuf[0] == '\0') { |
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114 | #ifdef HAVE_GETCWD |
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115 | getcwd (tbuf, MAXPATHLEN); |
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116 | #else |
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117 | # ifdef HAVE_GETWD |
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118 | getwd (tbuf); |
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119 | # endif |
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120 | #endif |
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121 | } |
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122 | |
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123 | if (tbuf[strlen(tbuf)-1] != '/') strcat(tbuf, "/"); |
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124 | strcat (tbuf, name); |
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125 | |
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126 | /* If we can execute the named file, then return it. */ |
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127 | if (! access (tbuf, X_OK)) |
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128 | { |
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129 | #ifdef WINNT |
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130 | if (extra != NULL) |
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131 | free(extra); |
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132 | #endif |
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133 | strcpy(executable, tbuf); |
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134 | #ifdef __CYGWIN__ |
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135 | strcat(executable, ".exe"); |
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136 | #endif |
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137 | return executable; |
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138 | } |
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139 | |
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140 | if (*p != '\0') |
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141 | { |
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142 | p ++; |
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143 | } |
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144 | else |
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145 | { |
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146 | break; |
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147 | } |
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148 | } |
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149 | } |
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150 | } |
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151 | return NULL; |
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152 | } |
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153 | |
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154 | #ifdef HAVE_READLINK |
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155 | /* similar to readlink, but dont' mess up absolute pathnames */ |
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156 | static int my_readlink(const char* name, char* buf, size_t bufsize) |
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157 | { |
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158 | char buf2[MAXPATHLEN]; |
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159 | int ret; |
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160 | |
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161 | if ((ret = readlink(name, buf2, bufsize)) > 0) |
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162 | { |
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163 | buf2[ret] = 0; |
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164 | if (*name == '/' && *buf2 != '/') |
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165 | { |
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166 | char* last = strrchr(name, '/'); |
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167 | int i = 0; |
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168 | while (&(name[i]) != last) |
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169 | { |
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170 | buf[i] = name[i]; |
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171 | i++; |
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172 | } |
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173 | buf[i] = '/'; |
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174 | i++; |
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175 | strcpy(&(buf[i]), buf2); |
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176 | return i + ret; |
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177 | } |
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178 | else |
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179 | { |
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180 | strcpy(buf, buf2); |
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181 | } |
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182 | } |
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183 | return ret; |
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184 | } |
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185 | |
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186 | #define MAX_LINK_LEVEL 10 |
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187 | /* similar to readlink (cf. man readlink), except that symbolic links are |
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188 | followed up to MAX_LINK_LEVEL |
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189 | */ |
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190 | static int full_readlink(const char* name, char* buf, size_t bufsize) |
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191 | { |
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192 | int ret; |
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193 | |
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194 | if ((ret=my_readlink(name, buf, bufsize)) > 0) |
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195 | { |
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196 | char buf2[MAXPATHLEN]; |
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197 | int ret2, i = 0; |
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198 | |
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199 | do |
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200 | { |
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201 | buf[ret] = '\0'; |
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202 | if ((ret2 = my_readlink(buf, buf2, MAXPATHLEN)) > 0) |
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203 | { |
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204 | i++; |
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205 | buf2[ret2] = '\0'; |
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206 | strcpy(buf, buf2); |
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207 | ret = ret2; |
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208 | } |
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209 | else |
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210 | { |
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211 | return ret; |
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212 | } |
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213 | } |
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214 | while (i<MAX_LINK_LEVEL); |
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215 | } |
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216 | return -1; |
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217 | } |
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218 | |
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219 | #ifdef WINNT |
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220 | char * _omFindExec (const char *name, char* exec); |
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221 | /* for windows, serch first for .exe */ |
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222 | char* omFindExec(const char *name, char* exec) |
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223 | { |
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224 | |
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225 | if (strstr(name, ".exe") == NULL) |
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226 | { |
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227 | char buf[MAXPATHLEN]; |
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228 | char* ret; |
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229 | strcpy(buf, name); |
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230 | strcat(buf, ".exe"); |
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231 | ret = _omFindExec(buf, exec); |
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232 | if (ret != NULL) return ret; |
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233 | } |
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234 | return _omFindExec(name, exec); |
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235 | } |
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236 | #else |
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237 | #define _omFindExec omFindExec |
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238 | #endif |
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239 | |
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240 | char * _omFindExec (const char *name, char* exec) |
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241 | { |
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242 | char * link = omFindExec_link(name, exec); |
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243 | char buf[MAXPATHLEN]; |
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244 | int ret; |
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245 | |
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246 | if (link == NULL && (ret=full_readlink(name, buf, MAXPATHLEN)) > 0) |
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247 | { |
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248 | buf[ret] ='\0'; |
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249 | link = omFindExec_link(buf, exec); |
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250 | } |
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251 | if (link != NULL && (ret=full_readlink(link, buf, MAXPATHLEN)) > 0) |
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252 | { |
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253 | char *p = strrchr(link, '/'); |
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254 | |
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255 | |
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256 | if(p!=NULL) *(p+1)='\0'; |
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257 | buf[ret]='\0'; |
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258 | |
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259 | if (buf[0] != '/') |
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260 | { |
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261 | strcpy(exec, link); |
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262 | strcat(exec, buf); |
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263 | } |
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264 | else |
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265 | { |
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266 | strcpy(exec, buf); |
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267 | } |
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268 | |
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269 | return exec; |
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270 | } |
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271 | return link; |
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272 | } |
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273 | #endif /* HAVE_READLINK */ |
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274 | |
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275 | #else |
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276 | |
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277 | char* omFindExec (const char *name, char* exec) |
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278 | { |
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279 | return name; |
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280 | } |
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281 | |
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282 | #endif /* defined(HAVE_UNISTD_H) && defined(STDC_HEADERS) */ |
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