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#ifndef lint
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static const char RCSid[] = "$Id: getpath.c,v 2.19 2016/03/06 01:13:17 schorsch 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 rtio.h
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*/
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#include "copyright.h"
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#include <string.h>
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#include <ctype.h>
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#include "rtio.h"
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#include "paths.h"
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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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if (fname == NULL) { return(NULL); }
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pname[0] = '\0'; /* check for full specification */
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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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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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#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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if (ffname == NULL)
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return(NULL);
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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) || (strrchr(ffname, '.') != NULL)) {
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return core_getpath(ffname, searchpath, mode);
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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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/* 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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#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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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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