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;
+}