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greg |
1.1 |
#ifndef lint |
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schorsch |
2.15 |
static const char RCSid[] = "$Id: getpath.c,v 2.14 2003/07/17 09:21:29 schorsch Exp $"; |
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greg |
1.1 |
#endif |
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/* |
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* getpath.c - function to search for file in a list of directories |
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greg |
2.9 |
* |
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* External symbols declared in standard.h |
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*/ |
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greg |
2.10 |
#include "copyright.h" |
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greg |
1.1 |
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schorsch |
2.11 |
#include <string.h> |
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#include <ctype.h> |
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greg |
2.7 |
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greg |
2.6 |
#include "paths.h" |
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schorsch |
2.14 |
#include "rtio.h" |
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greg |
1.1 |
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schorsch |
2.11 |
#ifdef _WIN32 |
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static char * |
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core_getpath /* wrapped below: expand fname, return full path */ |
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#else |
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greg |
1.1 |
char * |
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schorsch |
2.11 |
getpath /* expand fname, return full path */ |
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#endif |
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( |
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register char *fname, |
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register char *searchpath, |
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int mode |
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) |
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greg |
1.1 |
{ |
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schorsch |
2.11 |
static char pname[PATH_MAX]; |
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schorsch |
2.15 |
char uname[512]; |
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greg |
1.1 |
register char *cp; |
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schorsch |
2.15 |
int i; |
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greg |
1.1 |
|
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schorsch |
2.11 |
if (fname == NULL) { return(NULL); } |
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greg |
1.1 |
|
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greg |
2.8 |
pname[0] = '\0'; /* check for full specification */ |
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schorsch |
2.11 |
|
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schorsch |
2.15 |
if (ISABS(fname)) { /* absolute path */ |
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schorsch |
2.11 |
strncpy(pname, fname, sizeof(pname)-1); |
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} else { |
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switch (*fname) { |
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case '.': /* relative to cwd */ |
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strncpy(pname, fname, sizeof(pname)-1); |
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break; |
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case '~': /* relative to home directory */ |
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fname++; |
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schorsch |
2.15 |
cp = uname; |
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for (i=0;i<sizeof(uname)&&*fname!='\0'&&!ISDIRSEP(*fname);i++) |
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schorsch |
2.11 |
*cp++ = *fname++; |
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*cp = '\0'; |
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schorsch |
2.15 |
cp = gethomedir(uname, pname, sizeof(pname)); |
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if(cp == NULL) return NULL; |
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schorsch |
2.11 |
strncat(pname, fname, sizeof(pname)-strlen(pname)-1); |
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break; |
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greg |
1.1 |
} |
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} |
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greg |
2.8 |
if (pname[0]) /* got it, check access if search requested */ |
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return(searchpath==NULL||access(pname,mode)==0 ? pname : NULL); |
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greg |
1.1 |
|
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if (searchpath == NULL) { /* don't search */ |
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schorsch |
2.11 |
strncpy(pname, fname, sizeof(pname)-1); |
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greg |
1.1 |
return(pname); |
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} |
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schorsch |
2.11 |
/* check search path */ |
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greg |
1.1 |
do { |
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cp = pname; |
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schorsch |
2.11 |
while (*searchpath && (*cp = *searchpath++) != PATHSEP) { |
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greg |
2.3 |
cp++; |
72 |
schorsch |
2.11 |
} |
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if (cp > pname && !ISDIRSEP(cp[-1])) { |
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greg |
2.3 |
*cp++ = DIRSEP; |
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schorsch |
2.11 |
} |
76 |
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strncpy(cp, fname, sizeof(pname)-strlen(pname)-1); |
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greg |
1.1 |
if (access(pname, mode) == 0) /* file accessable? */ |
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return(pname); |
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} while (*searchpath); |
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schorsch |
2.11 |
/* not found */ |
81 |
greg |
1.1 |
return(NULL); |
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} |
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schorsch |
2.11 |
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#ifdef _WIN32 |
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/* This is a wrapper around the above, "emulating" access mode X_OK, |
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which is not supported on Windows. |
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If we see X_OK and the filename has no extension, then we'll remove |
89 |
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the X_OK from the mode, append ".exe" to the file name, and search |
90 |
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with the resulting string. If that fails, we'll try again with ".bat". |
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Theoretically, we might still not have execute rights on a file we find |
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like this, but that's rare enough not to be worth checking the ACLs. |
93 |
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*/ |
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char * |
95 |
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getpath( /* expand fname, return full path */ |
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register char *ffname, |
97 |
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register char *searchpath, |
98 |
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int mode |
99 |
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) |
100 |
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{ |
101 |
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register char *cp; |
102 |
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char fname[PATH_MAX]; |
103 |
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104 |
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if (ffname == NULL) |
105 |
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return(NULL); |
106 |
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107 |
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/* if we have a dot in the string, we assume there is a file name |
108 |
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extension present */ |
109 |
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/* XXX We'd better test for .exe/.bat/.etc explicitly */ |
110 |
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if (!(mode & X_OK) || (strrchr(ffname, '.') != NULL)) { |
111 |
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return core_getpath(ffname, searchpath, mode); |
112 |
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} |
113 |
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114 |
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/* We're looking for an executable, Windows doesn't have X_OK. */ |
115 |
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mode &= ~X_OK; |
116 |
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/* Append .exe */ |
117 |
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strncpy(fname, ffname, sizeof(fname)-5); |
118 |
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strcat(fname, ".exe"); |
119 |
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cp = core_getpath(fname, searchpath, mode); |
120 |
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if (cp != NULL) return cp; |
121 |
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122 |
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/* Try with .bat this time... */ |
123 |
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strncpy(fname, ffname, sizeof(fname)-5); |
124 |
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strcat(fname, ".bat"); |
125 |
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cp = core_getpath(fname, searchpath, mode); |
126 |
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return cp; |
127 |
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} |
128 |
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#endif /* _WIN32 */ |
129 |
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130 |
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131 |
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#ifdef TEST_MODULE |
132 |
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int main() |
133 |
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{ |
134 |
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char * fp; |
135 |
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char fmt[] = "%15s %-10s %s: %s\n"; |
136 |
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137 |
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fp = getpath("rayinit.cal", getenv("RAYPATH"), R_OK); |
138 |
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printf(fmt, "rayinit.cal", "RAYPATH", "R_OK", fp); |
139 |
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fp = getpath("mkillum", getenv("PATH"), X_OK); |
140 |
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printf(fmt, "mkillum", "PATH", "X_OK", fp); |
141 |
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fp = getpath("/", getenv("PATH"), W_OK); |
142 |
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printf(fmt, "/", "PATH", "W_OK", fp); |
143 |
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fp = getpath("~", getenv("PATH"), F_OK); |
144 |
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printf(fmt, "~", "PATH", "F_OK", fp); |
145 |
schorsch |
2.15 |
printf("Undefining HOME and HOMEPATH\n"); |
146 |
schorsch |
2.11 |
unsetenv("HOME"); |
147 |
schorsch |
2.15 |
unsetenv("HOMEPATH"); |
148 |
schorsch |
2.11 |
fp = getpath("~", getenv("PATH"), F_OK); |
149 |
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printf(fmt, "~", "PATH", "F_OK", fp); |
150 |
schorsch |
2.15 |
fp = getpath("~lp/blah", getenv("PATH"), F_OK); |
151 |
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printf(fmt, "~lp/blah", "PATH", "F_OK", fp); |
152 |
schorsch |
2.11 |
} |
153 |
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#endif |
154 |
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