From f60033cf04deb2019320ebb5ac7deebb16818703 Mon Sep 17 00:00:00 2001
From: Ben <ben@klemens.org>
Date: Tue, 18 Feb 2014 23:01:34 -0500
Subject: [PATCH] Add asprintf.c

---
 asprintf.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 asprintf.c

diff --git a/asprintf.c b/asprintf.c
new file mode 100644
index 0000000..2e5b6fb
--- /dev/null
+++ b/asprintf.c
@@ -0,0 +1,49 @@
+#ifndef HAVE_ASPRINTF
+#include <stdio.h>  //vsnprintf
+#include <stdlib.h> //malloc
+#include <stdarg.h> //va_start et al
+
+/* The declaration, to put into a .h file.    The __attribute___ tells the compiler to check printf-style type-compliance.
+   It's not C standard, but a lot of compilers supprt it. Just remove it if yours doesn't */
+
+int asprintf(char **str, char* fmt, ...) __attribute__ ((format (printf,2,3)));
+
+
+int asprintf(char **str, char* fmt, ...){
+    va_list argp; 
+    va_start(argp, fmt);
+    char one_char[1];
+    int len = vsnprintf(one_char, 1, fmt, argp);
+    if (len < 1){
+        fprintf(stderr, "An encoding error occurred. Setting the input pointer to NULL.\n");
+        *str = NULL;
+        return len;
+    }
+    va_end(argp);
+
+    *str = malloc(len+1);
+    if (!str) {
+        fprintf(stderr, "Couldn't allocate %i bytes.\n", len+1);
+        return -1;
+    }
+    va_start(argp, fmt);
+    vsnprintf(*str, len+1, fmt, argp);
+    va_end(argp);
+    return len;
+}
+#endif
+
+#ifdef Test_asprintf
+int main(){
+    char *s;
+    asprintf(&s, "hello, %s.", "—Reader—");
+    printf("%s\n", s);
+
+    asprintf(&s, "%c", '\0');
+    printf("blank string: [%s]\n", s);
+
+    int i = 0;
+    asprintf(&s, "%i", i++);
+    printf("Zero: %s\n", s);
+}
+#endif
-- 
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