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authorH. Peter Anvin <hpa@zytor.com>2008-03-26 16:25:35 -0700
committerH. Peter Anvin <hpa@zytor.com>2008-03-26 16:25:35 -0700
commit9eddd22a7b53b1d02fbae0d987df8af122924248 (patch)
tree882f5152880b0b1aa2d7a0619d30065acc69fb16 /gpxe/src/core/asprintf.c
parentbbb8f15936b851e6a0ef6f7bb2c95197bff35994 (diff)
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Add gPXE into the source tree; build unified imagesyslinux-3.70-pre7
Diffstat (limited to 'gpxe/src/core/asprintf.c')
-rw-r--r--gpxe/src/core/asprintf.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/gpxe/src/core/asprintf.c b/gpxe/src/core/asprintf.c
new file mode 100644
index 00000000..94d7e7c4
--- /dev/null
+++ b/gpxe/src/core/asprintf.c
@@ -0,0 +1,47 @@
+#include <stdint.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+
+/**
+ * Write a formatted string to newly allocated memory.
+ *
+ * @v strp Pointer to hold allocated string
+ * @v fmt Format string
+ * @v args Arguments corresponding to the format string
+ * @ret len Length of formatted string
+ */
+int vasprintf ( char **strp, const char *fmt, va_list args ) {
+ size_t len;
+ va_list args_tmp;
+
+ /* Calculate length needed for string */
+ va_copy ( args_tmp, args );
+ len = ( vsnprintf ( NULL, 0, fmt, args_tmp ) + 1 );
+ va_end ( args_tmp );
+
+ /* Allocate and fill string */
+ *strp = malloc ( len );
+ if ( ! *strp )
+ return -ENOMEM;
+ return vsnprintf ( *strp, len, fmt, args );
+}
+
+/**
+ * Write a formatted string to newly allocated memory.
+ *
+ * @v strp Pointer to hold allocated string
+ * @v fmt Format string
+ * @v ... Arguments corresponding to the format string
+ * @ret len Length of formatted string
+ */
+int asprintf ( char **strp, const char *fmt, ... ) {
+ va_list args;
+ int len;
+
+ va_start ( args, fmt );
+ len = vasprintf ( strp, fmt, args );
+ va_end ( args );
+ return len;
+}