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/*
# Taken from xlock, many authors...
#
# All Rights Reserved
#
# Permission to use, copy, modify, and distribute this software and
# its documentation for any purpose and without fee is hereby granted,
# provided that the above copyright notice appear in all copies and
# that both that copyright notice and this permission notice appear in
# supporting documentation, and that the name of the author not be
# used in advertising or publicity pertaining to distribution of the
# software without specific, written prior permission.
#
# This program is distributed in the hope that it will be "useful",
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
static FILE *
carefulOpen(char *fileName, const char *type)
{
FILE *fp = (FILE *) NULL;
int s;
struct stat fileStat;
s = stat(fileName, &fileStat);
if ((s >= 0 && S_ISREG(fileStat.st_mode)) || (s < 0 && type[0] == 'w')) {
if ((fp = fopen(fileName, type)) == NULL)
return (FILE *) NULL;
} else {
return (FILE *) NULL;
}
return fp;
}
static int
readable(char *fileName)
{
FILE *fp;
if ((fp = carefulOpen(fileName, "r")) == NULL)
return 0;
(void) fclose(fp);
return 1;
}
#ifdef WINVER
#define LASTDELIM '\\'
#else
#ifdef VMS
#define LASTDELIM ']'
#else
#define LASTDELIM '/'
#endif
#endif
static char *
baseName(char *fileName)
{
int i;
for (i = strlen(fileName); i >= 0; i--) {
if (fileName[i] == LASTDELIM
#ifdef WINVER
|| fileName[i] == '/'
#endif
)
return &fileName[i + 1];
}
return fileName;
}
char *
findFile(char *fileName)
{
if (readable(fileName))
return fileName;
else {
char *temp = baseName(fileName);
if (readable(temp))
return temp;
}
return NULL;
}
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