225f597379
This adds functions for piping a command line program's stdin or stdout. Note however that this is unidirectional only. This will be especially useful later on when implementing MP4 output, because MP4 output has to be piped to prevent unexpected program termination from corrupting the file.
81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
/*
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* Copyright (c) 2014 Hugh Bailey <obs.jim@gmail.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <stdio.h>
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#include "bmem.h"
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#include "pipe.h"
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struct os_process_pipe {
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bool read_pipe;
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FILE *file;
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};
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os_process_pipe_t *os_process_pipe_create(const char *cmd_line,
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const char *type)
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{
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struct os_process_pipe pipe = {0};
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struct os_process_pipe *out;
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if (!cmd_line || !type) {
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return NULL;
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}
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pipe.file = popen(cmd_line, type);
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pipe.read_pipe = *type == 'r';
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if (pipe.file == (FILE*)-1 || pipe.file == NULL) {
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return NULL;
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}
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out = bmalloc(sizeof(pipe));
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*out = pipe;
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return out;
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}
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void os_process_pipe_destroy(os_process_pipe_t *pp)
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{
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if (pp) {
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pclose(pp->file);
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bfree(pp);
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}
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}
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size_t os_process_pipe_read(os_process_pipe_t *pp, uint8_t *data, size_t len)
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{
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if (!pp) {
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return 0;
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}
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if (!pp->read_pipe) {
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return 0;
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}
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return fread(data, len, 1, pp->file);
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}
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size_t os_process_pipe_write(os_process_pipe_t *pp, const uint8_t *data,
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size_t len)
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{
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if (!pp) {
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return 0;
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}
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if (pp->read_pipe) {
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return 0;
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}
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return fwrite(data, len, 1, pp->file);
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}
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