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Cream of the Crop 1
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Cream of the Crop 1.iso
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PROGRAM
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SNIP1292.ARJ
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PFOPEN.C
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C/C++ Source or Header
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1992-01-05
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2KB
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/*
* Written and released to the public domain by David Engel.
*
* This function attempts to open a file which may be in any of
* several directories. It is particularly useful for opening
* configuration files. For example, PROG.EXE can easily open
* PROG.CFG (which is kept in the same directory) by executing:
*
* cfg_file = pfopen("PROG.CFG", "r", getenv("PATH"));
*
* NULL is returned if the file can't be opened.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifndef __ZTC__
#define FILENAME_MAX _MAX_PATH
#endif
#ifdef unix
#define SEP_CHARS ":"
#else
#define SEP_CHARS ";"
#endif
FILE *pfopen(const char *name, const char *mode, const char *dirs)
{
char *ptr;
char *tdirs;
FILE *file = NULL;
if (dirs == NULL || dirs[0] == '\0')
return NULL;
if ((tdirs = malloc(strlen(dirs)+1)) == NULL)
return NULL;
strcpy(tdirs, dirs);
for (ptr = strtok(tdirs, SEP_CHARS); file == NULL && ptr != NULL;
ptr = strtok(NULL, SEP_CHARS))
{
size_t len;
char work[FILENAME_MAX];
strcpy(work, ptr);
len = strlen(work);
if (len && work[len-1] != '/' && work[len-1] != '\\')
strcat(work, "/");
strcat(work, name);
file = fopen(work, mode);
}
free(tdirs);
return file;
}
#ifdef TEST
int main(int argc, char **argv)
{
FILE *file;
if (argc != 4)
{
fprintf(stderr, "usage: pfopen name mode dirs\n");
exit(1);
}
file = pfopen(argv[1], argv[2], argv[3]);
printf("%s \"%s\" with mode \"%s\"\n", (file == NULL) ?
"Could not open" : "Opened", argv[1], argv[2]);
return 0;
}
#endif