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