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3d8a6507ca
This avoids poking into the filter data structure at various points in the code. We rely on the fact that the number of arguments is fixed based on the filter type (set in cgit_new_filter) and that the call sites all know which filter type they're using. Signed-off-by: John Keeping <john@keeping.me.uk>
96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
/* filter.c: filter framework functions
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*
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* Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
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*
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* Licensed under GNU General Public License v2
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* (see COPYING for full license text)
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*/
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#include "cgit.h"
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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int cgit_open_filter(struct cgit_filter *filter, ...)
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{
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int i;
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va_list ap;
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va_start(ap, filter);
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for (i = 0; i < filter->extra_args; i++)
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filter->argv[i+1] = va_arg(ap, char *);
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va_end(ap);
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filter->old_stdout = chk_positive(dup(STDOUT_FILENO),
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"Unable to duplicate STDOUT");
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chk_zero(pipe(filter->pipe_fh), "Unable to create pipe to subprocess");
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filter->pid = chk_non_negative(fork(), "Unable to create subprocess");
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if (filter->pid == 0) {
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close(filter->pipe_fh[1]);
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chk_non_negative(dup2(filter->pipe_fh[0], STDIN_FILENO),
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"Unable to use pipe as STDIN");
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execvp(filter->cmd, filter->argv);
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die_errno("Unable to exec subprocess %s", filter->cmd);
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}
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close(filter->pipe_fh[0]);
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chk_non_negative(dup2(filter->pipe_fh[1], STDOUT_FILENO),
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"Unable to use pipe as STDOUT");
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close(filter->pipe_fh[1]);
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return 0;
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}
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int cgit_close_filter(struct cgit_filter *filter)
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{
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int i, exit_status;
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chk_non_negative(dup2(filter->old_stdout, STDOUT_FILENO),
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"Unable to restore STDOUT");
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close(filter->old_stdout);
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if (filter->pid < 0)
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goto done;
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waitpid(filter->pid, &exit_status, 0);
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if (WIFEXITED(exit_status) && !WEXITSTATUS(exit_status))
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goto done;
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die("Subprocess %s exited abnormally", filter->cmd);
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done:
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for (i = 0; i < filter->extra_args; i++)
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filter->argv[i+1] = NULL;
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return 0;
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}
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struct cgit_filter *cgit_new_filter(const char *cmd, filter_type filtertype)
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{
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struct cgit_filter *f;
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int args_size = 0;
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if (!cmd || !cmd[0])
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return NULL;
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f = xmalloc(sizeof(struct cgit_filter));
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memset(f, 0, sizeof(struct cgit_filter));
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switch (filtertype) {
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case SOURCE:
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case ABOUT:
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f->extra_args = 1;
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break;
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case COMMIT:
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default:
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f->extra_args = 0;
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break;
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}
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f->cmd = xstrdup(cmd);
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args_size = (2 + f->extra_args) * sizeof(char *);
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f->argv = xmalloc(args_size);
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memset(f->argv, 0, args_size);
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f->argv[0] = f->cmd;
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return f;
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}
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