add pa_vsnprintf()

git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/glitch-free@2434 fefdeb5f-60dc-0310-8127-8f9354f1896f

2 files changed, 19 insertions, 2 deletions

diff --git a/src/pulsecore/core-util.c b/src/pulsecore/core-util.c
index df110966..c8ea4f52 100644
--- a/src/pulsecore/core-util.c
+++ b/src/pulsecore/core-util.c
@@ -1592,12 +1592,28 @@ int pa_snprintf(char *str, size_t size, const char *format, ...) {
     pa_assert(format);
 
     va_start(ap, format);
-    ret = vsnprintf(str, size, format, ap);
+    ret = pa_vsnprintf(str, size, format, ap);
     va_end(ap);
 
+    return ret;
+}
+
+/* Same as vsnprintf, but guarantees NUL-termination on every platform */
+int pa_vsnprintf(char *str, size_t size, const char *format, va_list ap) {
+    int ret;
+
+    pa_assert(str);
+    pa_assert(size > 0);
+    pa_assert(format);
+
+    ret = vsnprintf(str, size, format, ap);
+
     str[size-1] = 0;
 
-    return ret;
+    if (ret < 0)
+        ret = strlen(str);
+
+    return PA_MIN((int) size-1, ret);
 }
 
 /* Truncate the specified string, but guarantee that the string
diff --git a/src/pulsecore/core-util.h b/src/pulsecore/core-util.h
index e9313d4b..ec4cdc43 100644
--- a/src/pulsecore/core-util.h
+++ b/src/pulsecore/core-util.h
@@ -128,6 +128,7 @@ int pa_atou(const char *s, uint32_t *ret_u);
 int pa_atof(const char *s, float *ret_f);
 
 int pa_snprintf(char *str, size_t size, const char *format, ...);
+int pa_vsnprintf(char *str, size_t size, const char *format, va_list ap);
 
 char *pa_truncate_utf8(char *c, size_t l);