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/*
* Revision Control Information
*
* /projects/hsis/CVS/utilities/util/pathsearch.c,v
* rajeev
* 1.3
* 1995/08/08 22:41:24
*
*/
/* LINTLIBRARY */
#if HAVE_SYS_FILE_H
# include <sys/file.h>
#endif
#if HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif
#include "util.h"
/**Function********************************************************************
Synopsis [ Check that a given file is present and accessible ]
SideEffects [none]
******************************************************************************/
static int
check_file(filename, mode)
char *filename;
char *mode;
{
#if defined(HAVE_SYS_STAT_H)
struct stat stat_rec;
int access_char = mode[0];
int access_mode = R_OK;
/* First check that the file is a regular file. */
if (stat(filename,&stat_rec) == 0
&& (stat_rec.st_mode&S_IFMT) == S_IFREG) {
if (access_char == 'w') {
access_mode = W_OK;
} else if (access_char == 'x') {
access_mode = X_OK;
}
return access(filename,access_mode) == 0;
}
return 0;
#else
FILE *fp;
int got_file;
if (strcmp(mode, "x") == 0) {
mode = "r";
}
fp = fopen(filename, mode);
got_file = (fp != 0);
if (fp != 0) {
(void) fclose(fp);
}
return got_file;
#endif
}
/**Function********************************************************************
Synopsis [ Search for a program in all possible paths ]
SideEffects [none]
******************************************************************************/
char *
util_path_search(prog)
char *prog;
{
#ifdef HAVE_GETENV
return util_file_search(prog, getenv("PATH"), "x");
#else
return util_file_search(prog, NIL(char), "x");
#endif
}
char *
util_file_search(file, path, mode)
char *file; /* file we're looking for */
char *path; /* search path, colon separated */
char *mode; /* "r", "w", or "x" */
{
int quit;
char *buffer, *filename, *save_path, *cp;
if (path == 0 || strcmp(path, "") == 0) {
path = "."; /* just look in the current directory */
}
save_path = path = util_strsav(path);
quit = 0;
do {
cp = strchr(path, ':');
if (cp != 0) {
*cp = '\0';
} else {
quit = 1;
}
/* cons up the filename out of the path and file name */
if (strcmp(path, ".") == 0) {
buffer = util_strsav(file);
} else {
buffer = ALLOC(char, strlen(path) + strlen(file) + 4);
(void) sprintf(buffer, "%s/%s", path, file);
}
filename = util_tilde_expand(buffer);
FREE(buffer);
/* see if we can access it */
if (check_file(filename, mode)) {
FREE(save_path);
return filename;
}
FREE(filename);
path = ++cp;
} while (! quit);
FREE(save_path);
return 0;
}
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