mirror of
https://github.com/troglobit/libite.git
synced 2026-10-14 10:19:31 +00:00
95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/* Formatted fopen()
|
|
*
|
|
* Copyright (c) 2021 Joachim Wiberg <troglobit@gmail.com>
|
|
*
|
|
* Permission to use, copy, modify, and/or distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
/**
|
|
* @file fopenf.c
|
|
* @author Joachim Wiberg
|
|
* @date 2021
|
|
* @copyright ISC License
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <stdarg.h>
|
|
#include <stdlib.h>
|
|
|
|
/**
|
|
* Similar to fopenf() except it takes a @a va_list argument
|
|
* @param mode An fopen() mode string, e.g. "w+".
|
|
* @param fmt Formatted string to be composed into a pathname.
|
|
* @param ap List of variable arguemnts from va_start().
|
|
*
|
|
* See fopenf() for details.
|
|
*
|
|
* @returns a FILE pointer, or @c NULL on error.
|
|
*/
|
|
FILE *vfopenf(const char *mode, const char *fmt, va_list ap)
|
|
{
|
|
va_list apc;
|
|
char *file;
|
|
int len;
|
|
|
|
va_copy(apc, ap);
|
|
len = vsnprintf(NULL, 0, fmt, apc);
|
|
va_end(apc);
|
|
|
|
file = alloca(len + 1);
|
|
if (!file) {
|
|
errno = ENOMEM;
|
|
return NULL;
|
|
}
|
|
|
|
va_copy(apc, ap);
|
|
vsnprintf(file, len + 1, fmt, apc);
|
|
va_end(apc);
|
|
|
|
return fopen(file, mode);
|
|
}
|
|
|
|
/**
|
|
* Open a file based on the formatted string and optional arguments
|
|
* @param mode An fopen() mode string, e.g. "w+".
|
|
* @param fmt Formatted string to be composed into a pathname.
|
|
*
|
|
* This function is an extension to the fopen() family, lessening the burden
|
|
* of first having to compose the filename from parts in a seprate buffer.
|
|
*
|
|
* @returns Upon successful completion, fopenf() returns a FILE pointer.
|
|
* Otherwise, @c NULL is returned and @a errno is set to indicate the
|
|
* error.
|
|
*/
|
|
FILE *fopenf(const char *mode, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
FILE *fp;
|
|
|
|
va_start(ap, fmt);
|
|
fp = vfopenf(mode, fmt, ap);
|
|
va_end(ap);
|
|
if (!fp)
|
|
return NULL;
|
|
|
|
return fp;
|
|
}
|
|
|
|
/**
|
|
* Local Variables:
|
|
* indent-tabs-mode: t
|
|
* c-file-style: "linux"
|
|
* End:
|
|
*/
|