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Diffstat (limited to 'lib/libpkg/exec.c')
-rw-r--r-- | lib/libpkg/exec.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/lib/libpkg/exec.c b/lib/libpkg/exec.c new file mode 100644 index 0000000..04891d3 --- /dev/null +++ b/lib/libpkg/exec.c @@ -0,0 +1,106 @@ +/* + * FreeBSD install - a package for the installation and maintainance + * 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 "pkg.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; + int ret, maxargs; + + 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"); + 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; + int 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"); + return NULL; + } +#ifdef DEBUG + fprintf(stderr, "Executing %s\n", cmd); +#endif + fflush(NULL); + fp = popen(cmd, "r"); + if (fp == NULL) { + warnx("popen() failed"); + 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; +} |