src/util/pathsearch.c File Reference

#include "util.h"

Include dependency graph for pathsearch.c:

Go to the source code of this file.

Functions
int	util_check_file (char const *filename, char const *mode)
char *	util_path_search (char const *prog)
char *	util_file_search (char const *file, char *path, char const *mode)

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Function Documentation

int util_check_file	(	char const *	filename,
		char const *	mode
	)

Function********************************************************************

Synopsis [ Check that a given file is present and accessible ]

SideEffects [none]

Definition at line 26 of file pathsearch.c.

{
#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 && S_ISREG(stat_rec.st_mode)) {
        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
}

char* util_file_search	(	char const *	file,
		char *	path,
		char const *	mode
	)

Definition at line 81 of file pathsearch.c.

{
    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 (util_check_file(filename, mode)) {
            FREE(save_path);
            return filename;
        }
        FREE(filename);
        path = ++cp;
    } while (! quit); 

    FREE(save_path);
    return 0;
}

char* util_path_search

(

char const *

prog

)

Function********************************************************************

Synopsis [ Search for a program in all possible paths ]

SideEffects [none]

Definition at line 71 of file pathsearch.c.

{
#ifdef HAVE_GETENV
    return util_file_search(prog, getenv("PATH"), "x");
#else
    return util_file_search(prog, NIL(char), "x");
#endif
}