110 lines
2.4 KiB
C
110 lines
2.4 KiB
C
/*
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* FreeBSD install - a package for the installation and maintenance
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* of non-core utilities.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* Jordan K. Hubbard
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* 18 July 1993
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*
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* Miscellaneous system routines.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "lib.h"
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#include <err.h>
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/*
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* Unusual system() substitute. Accepts format string and args,
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* builds and executes command. Returns exit code.
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*/
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int
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vsystem(const char *fmt, ...)
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{
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va_list args;
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char *cmd;
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int ret, maxargs;
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maxargs = sysconf(_SC_ARG_MAX);
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maxargs -= 32; /* some slop for the sh -c */
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cmd = malloc(maxargs);
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if (!cmd) {
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warnx("vsystem can't alloc arg space");
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return 1;
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}
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va_start(args, fmt);
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if (vsnprintf(cmd, maxargs, fmt, args) > maxargs) {
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warnx("vsystem args are too long");
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va_end(args);
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return 1;
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}
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#ifdef DEBUG
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printf("Executing %s\n", cmd);
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#endif
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ret = system(cmd);
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va_end(args);
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free(cmd);
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return ret;
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}
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char *
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vpipe(const char *fmt, ...)
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{
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FILE *fp;
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char *cmd, *rp;
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int maxargs;
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va_list args;
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rp = malloc(MAXPATHLEN);
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if (!rp) {
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warnx("vpipe can't alloc buffer space");
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return NULL;
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}
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maxargs = sysconf(_SC_ARG_MAX);
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maxargs -= 32; /* some slop for the sh -c */
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cmd = alloca(maxargs);
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if (!cmd) {
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warnx("vpipe can't alloc arg space");
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return NULL;
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}
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va_start(args, fmt);
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if (vsnprintf(cmd, maxargs, fmt, args) > maxargs) {
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warnx("vsystem args are too long");
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va_end(args);
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return NULL;
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}
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#ifdef DEBUG
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fprintf(stderr, "Executing %s\n", cmd);
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#endif
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fflush(NULL);
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fp = popen(cmd, "r");
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if (fp == NULL) {
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warnx("popen() failed");
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va_end(args);
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return NULL;
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}
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get_string(rp, MAXPATHLEN, fp);
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#ifdef DEBUG
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fprintf(stderr, "Returned %s\n", rp);
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#endif
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va_end(args);
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if (pclose(fp) || (strlen(rp) == 0)) {
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free(rp);
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return NULL;
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}
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return rp;
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}
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