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#ifndef lint |
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static const char RCSid[] = "$Id: getpath.c,v 2.23 2021/12/05 15:44:15 greg Exp $"; |
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#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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* |
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* External symbols declared in paths.h |
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*/ |
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|
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#include "copyright.h" |
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|
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#include <ctype.h> |
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|
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#include "paths.h" |
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|
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|
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#if defined(_WIN32) || defined(_WIN64) |
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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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char * |
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getpath /* expand fname, return full path */ |
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#endif |
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( |
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char *fname, |
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char *searchpath, |
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int mode |
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) |
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{ |
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static char pname[PATH_MAX]; |
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char uname[512]; |
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char *cp; |
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int i; |
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|
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if (!fname | (fname == pname)) |
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return(fname); |
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|
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pname[0] = '\0'; /* check for full specification */ |
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|
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if (ISABS(fname)) { /* absolute path */ |
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strlcpy(pname, fname, sizeof(pname)); |
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} else { |
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switch (*fname) { |
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case '.': /* relative to cwd */ |
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strlcpy(pname, fname, sizeof(pname)); |
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break; |
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case '~': /* relative to home directory */ |
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fname++; |
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cp = uname; |
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for (i = 0; i < sizeof(uname) && *fname |
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&& !ISDIRSEP(*fname); i++) |
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*cp++ = *fname++; |
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*cp = '\0'; |
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cp = gethomedir(uname, pname, sizeof(pname)); |
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if(cp == NULL) return NULL; |
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strlcat(pname, fname, sizeof(pname)); |
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break; |
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} |
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} |
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if (pname[0]) /* got it, check access if search requested */ |
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return(!searchpath || access(pname,mode)==0 ? pname : NULL); |
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|
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if (!searchpath) { /* no search? */ |
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strlcpy(pname, fname, sizeof(pname)); |
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return(pname); |
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} |
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/* check search path */ |
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do { |
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cp = pname; |
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while (*searchpath && (*cp = *searchpath++) != PATHSEP) |
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cp += (cp-pname < sizeof(pname)-2); |
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if (cp > pname && !ISDIRSEP(cp[-1])) |
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*cp++ = DIRSEP; |
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*cp = '\0'; |
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strlcat(pname, fname, sizeof(pname)); |
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if (access(pname, mode) == 0) /* file accessable? */ |
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return(pname); |
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} while (*searchpath); |
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/* not found */ |
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return(NULL); |
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} |
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|
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|
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#if defined(_WIN32) || defined(_WIN64) |
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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 |
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the X_OK from the mode, append ".exe" to the file name, and search |
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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. |
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*/ |
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char * |
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getpath( /* expand fname, return full path */ |
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char *ffname, |
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char *searchpath, |
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int mode |
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) |
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{ |
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char *cp; |
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char fname[PATH_MAX]; |
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|
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if (!ffname | (ffname == fname)) |
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return(ffname); |
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|
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/* if we have a dot in the string, we assume there is a file name |
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extension present */ |
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/* XXX We'd better test for .exe/.bat/.etc explicitly */ |
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if (!(mode & X_OK) || strchr(ffname, '.') > ffname) { |
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return core_getpath(ffname, searchpath, mode); |
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} |
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|
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/* We're looking for an executable, Windows doesn't have X_OK. */ |
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mode &= ~X_OK; |
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/* Append .exe */ |
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strncpy(fname, ffname, sizeof(fname)-5); |
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strcat(fname, ".exe"); |
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cp = core_getpath(fname, searchpath, mode); |
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if (cp != NULL) return cp; |
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|
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/* Try with .bat this time... */ |
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strncpy(fname, ffname, sizeof(fname)-5); |
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strcat(fname, ".bat"); |
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cp = core_getpath(fname, searchpath, mode); |
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return cp; |
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} |
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#endif /* _WIN32 */ |
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|
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|
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#ifdef TEST_MODULE |
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int main() |
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{ |
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char * fp; |
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char fmt[] = "%15s %-10s %s: %s\n"; |
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|
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fp = getpath("rayinit.cal", getenv("RAYPATH"), R_OK); |
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printf(fmt, "rayinit.cal", "RAYPATH", "R_OK", fp); |
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fp = getpath("mkillum", getenv("PATH"), X_OK); |
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printf(fmt, "mkillum", "PATH", "X_OK", fp); |
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fp = getpath("/", getenv("PATH"), W_OK); |
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printf(fmt, "/", "PATH", "W_OK", fp); |
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fp = getpath("~", getenv("PATH"), F_OK); |
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printf(fmt, "~", "PATH", "F_OK", fp); |
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printf("Undefining HOME and HOMEPATH\n"); |
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unsetenv("HOME"); |
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unsetenv("HOMEPATH"); |
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fp = getpath("~", getenv("PATH"), F_OK); |
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printf(fmt, "~", "PATH", "F_OK", fp); |
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fp = getpath("~lp/blah", getenv("PATH"), F_OK); |
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printf(fmt, "~lp/blah", "PATH", "F_OK", fp); |
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} |
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#endif |
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