s3:util: Move static file_pload() function to lib/util

file_pload() is static private function in Samba3 library, however it
does not have any special dependencies and might be widely used as
common function, so moving it into common samba-util library.

Extra fix needed to enable easy back-port of code for:

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13964

Signed-off-by: Aliaksei Karaliou <akaraliou@panasas.com>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
(cherry picked from commit d21fc7d8b86b0cddc619ffe528d9cd93eeedbb0b)

2 files changed, 53 insertions, 0 deletions

diff --git a/lib/util/samba_util.h b/lib/util/samba_util.h
index 7b96a595d43..fff5478cd6d 100644
--- a/lib/util/samba_util.h
+++ b/lib/util/samba_util.h
@@ -394,6 +394,11 @@ _PUBLIC_ int fdprintf(int fd, const char *format, ...) PRINTF_ATTRIBUTE(2,3);
  */
 bool file_compare(const char *path1, const char *path2);
 
+/*
+  load from a pipe into memory.
+ */
+char *file_pload(const char *syscmd, size_t *size);
+
 /* The following definitions come from lib/util/util.c  */
 
 
diff --git a/lib/util/util_file.c b/lib/util/util_file.c
index 926eda240f6..90d39f7cdd3 100644
--- a/lib/util/util_file.c
+++ b/lib/util/util_file.c
@@ -24,6 +24,8 @@
 #include "system/filesys.h"
 #include <talloc.h>
 #include "lib/util/samba_util.h"
+#include "lib/util/sys_popen.h"
+#include "lib/util/sys_rw.h"
 #include "lib/util/debug.h"
 
 /**
@@ -362,3 +364,49 @@ bool file_compare(const char *path1, const char *path2)
 	talloc_free(mem_ctx);
 	return true;
 }
+
+
+/**
+ Load from a pipe into memory.
+**/
+char *file_pload(const char *syscmd, size_t *size)
+{
+	int fd, n;
+	char *p;
+	char buf[1024];
+	size_t total;
+
+	fd = sys_popen(syscmd);
+	if (fd == -1) {
+		return NULL;
+	}
+
+	p = NULL;
+	total = 0;
+
+	while ((n = sys_read(fd, buf, sizeof(buf))) > 0) {
+		p = talloc_realloc(NULL, p, char, total + n + 1);
+		if (!p) {
+		        DEBUG(0,("file_pload: failed to expand buffer!\n"));
+			close(fd);
+			return NULL;
+		}
+		memcpy(p+total, buf, n);
+		total += n;
+	}
+
+	if (p) {
+		p[total] = 0;
+	}
+
+	/* FIXME: Perhaps ought to check that the command completed
+	 * successfully (returned 0); if not the data may be
+	 * truncated. */
+	sys_pclose(fd);
+
+	if (size) {
+		*size = total;
+	}
+
+	return p;
+}