X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fcommon%2Fstring-utils%2Fstring-utils.cpp;h=5cfcef2566fec7f3bf5173eb176ddab8cf1735d5;hb=c9e313bc594f40a86eed237dce222c0fc99c957f;hp=8dcc6b2aae9ce9fab7b3beeefbea0b495fc15db4;hpb=4ff750609549a99f6b318ce600c42c90d4f2e480;p=lttng-tools.git

diff --git a/src/common/string-utils/string-utils.cpp b/src/common/string-utils/string-utils.cpp
index 8dcc6b2aa..5cfcef256 100644
--- a/src/common/string-utils/string-utils.cpp
+++ b/src/common/string-utils/string-utils.cpp
@@ -1,20 +1,22 @@
 /*
  * Copyright (C) 2017 Philippe Proulx <pproulx@efficios.com>
  *
- * SPDX-License-Identifier: GPL-2.0-only
+ * SPDX-License-Identifier: LGPL-2.1-only
  *
  */
 
 #define _LGPL_SOURCE
 #include <stdlib.h>
+#include <stdio.h>
 #include <string.h>
 #include <stdbool.h>
 #include <type_traits>
 #include <assert.h>
 #include <errno.h>
+#include <stdarg.h>
 
-#include "string-utils.h"
-#include "../macros.h"
+#include "string-utils.hpp"
+#include "../macros.hpp"
 
 enum star_glob_pattern_type_flags {
 	STAR_GLOB_PATTERN_TYPE_FLAG_NONE = 0,
@@ -64,7 +66,7 @@ void strutils_normalize_star_glob_pattern(char *pattern)
 				goto end;
 			}
 
-			/* Fall through default case. */
+			/* fall through */
 		default:
 			got_star = false;
 			break;
@@ -395,3 +397,49 @@ int strutils_append_str(char **s, const char *append)
 	free(old);
 	return 0;
 }
+
+int strutils_appendf(char **s, const char *fmt, ...)
+{
+	char *new_str;
+	size_t oldlen = (*s) ? strlen(*s) : 0;
+	int ret;
+	va_list args;
+
+	/* Compute length of formatted string we append. */
+	va_start(args, fmt);
+	ret = vsnprintf(NULL, 0, fmt, args);
+	va_end(args);
+
+	if (ret == -1) {
+		goto end;
+	}
+
+	/* Allocate space for old string + new string + \0. */
+	new_str = (char *) zmalloc(oldlen + ret + 1);
+	if (!new_str) {
+		ret = -ENOMEM;
+		goto end;
+	}
+
+	/* Copy old string, if there was one. */
+	if (oldlen) {
+		strcpy(new_str, *s);
+	}
+
+	/* Format new string in-place. */
+	va_start(args, fmt);
+	ret = vsprintf(&new_str[oldlen], fmt, args); 
+	va_end(args);
+
+	if (ret == -1) {
+		ret = -1;
+		goto end;
+	}
+
+	free(*s);
+	*s = new_str;
+	new_str = NULL;
+
+end:
+	return ret;
+}