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libite

    1: /* Check if file exists
    2:  *
    3:  * Copyright (c) 2008 Claudio Matsuoka <http://helllabs.org/finit/>
    4:  *
    5:  * Permission is hereby granted, free of charge, to any person obtaining a copy
    6:  * of this software and associated documentation files (the "Software"), to deal
    7:  * in the Software without restriction, including without limitation the rights
    8:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    9:  * copies of the Software, and to permit persons to whom the Software is
   10:  * furnished to do so, subject to the following conditions:
   11:  *
   12:  * The above copyright notice and this permission notice shall be included in
   13:  * all copies or substantial portions of the Software.
   14:  *
   15:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   16:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   17:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   18:  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   19:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   20:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   21:  * THE SOFTWARE.
   22:  */
   23: 
   24: #include <errno.h>
   25: #include <unistd.h>
   26: 
   27: /**
   28:  * fexist - Check if a file exists in the file system.
   29:  * @file: File to look for, with full path.
   30:  *
   31:  * Returns:
   32:  * %TRUE(1) if the file exists, otherwise %FALSE(0).
   33:  */
   34: int fexist(char *file)
   35: {
   36: 	if (!file) {
   37: 		errno = EINVAL;
   38: 		return 0;	/* Doesn't exist ... */
   39: 	}
   40: 
   41: 	if (-1 == access(file, F_OK))
   42: 		return 0;
   43: 
   44: 	return 1;
   45: }
   46: 
   47: #ifdef UNITTEST
   48: #include "lite.h"
   49: 
   50: int main(void)
   51: {
   52: 	int i = 0;
   53: 	struct { char *file; int exist; } arr[] = {
   54: 		{ "/etc/passwd", 1 },
   55: 		{ "/etc/kalle",  0 },
   56: 		{ "/sbin/init",  1 },
   57: 		{ "/dev/null",   1 },
   58: 		{ NULL,  0 },
   59: 	};
   60: 	FILE *src, *dst;
   61: 
   62: 	for (i = 0; i < NELEMS(arr); i++) {
   63: 		if (fexist(arr[i].file) != arr[i].exist)
   64: 			err(1, "Failed fexist(%s)", arr[i].file ?: "NULL");
   65: 		else
   66: 			printf("File %-11s %-14s => OK!\n", arr[i].file ?: "NULL",
   67: 			       arr[i].exist ? "does exist" : "does not exist");
   68: 	}
   69: 
   70: 	return 0;
   71: }
   72: #endif /* UNITTEST */
   73: 
   74: /**
   75:  * Local Variables:
   76:  *  compile-command: "make V=1 -f fexist.mk"
   77:  *  version-control: t
   78:  *  indent-tabs-mode: t
   79:  *  c-file-style: "linux"
   80:  * End:
   81:  */