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64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
/* Formatted popen()
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*
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* Copyright (c) 2023 Tobias Waldekranz <tobias@waldekranz.com>
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* Copyright (c) 2023 Joachim Wiberg <troglobit@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdlib.h>
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/**
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* Formatted pipe stream to or from a process
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* @param type A popen() type, "r" or "w", can also include "e" for @c O_CLOEXEC.
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* @param fmt Formatted string to be composed into a shell command line.
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*
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* This function is an extension to popen(), lessening the burden of
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* first having to compose the filename from parts in a seprate buffer.
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*
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* @returns Upon successful completion, popenf() returns a FILE pointer.
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* Otherwise, @c NULL is returned and @a errno is set to indicate the
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* error.
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*/
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FILE *popenf(const char *type, const char *fmt, ...)
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{
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va_list ap;
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char *cmd;
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int len;
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va_start(ap, fmt);
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len = vsnprintf(NULL, 0, fmt, ap);
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va_end(ap);
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cmd = alloca(len + 1);
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if (!cmd) {
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errno = ENOMEM;
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return NULL;
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}
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va_start(ap, fmt);
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vsnprintf(cmd, len + 1, fmt, ap);
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va_end(ap);
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return popen(cmd, type);
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}
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