Add string module

string.c

@@ -0,0 +1,104 @@
+/******************************************************************************
+ *
+ *                Copyright (c) 2017-2019 by Löwenware Ltd
+ *             Please, refer LICENSE file for legal information
+ *
+ ******************************************************************************/
+
+/**
+ * @file string.c
+ * @author Ilja Kartašov <ik@lowenware.com>
+ * @brief cStuff string module implementation
+ *
+ * @see https://lowenware.com/
+ */
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "string.h"
+
+int
+cstuff_strcpy(char **out, const char *in)
+{
+	return cstuff_strncpy(out, in, strlen(in));
+}
+
+
+int
+cstuff_strncpy(char **out, const char *in, int len)
+{
+	char *s;
+ 
+	if (!(s = malloc( len + 1 )))
+		return -1;
+
+	strncpy(s, in, len);
+	s[len]=0;
+
+	*out = s;
+
+	return len;
+}
+
+
+int
+cstuff_strset(char **out, const char *in)
+{
+	return cstuff_strnset(out, in, strlen(in));
+}
+
+
+int
+cstuff_strnset(char **out, const char *in, int len)
+{
+	char *s;
+
+	if (!(s = realloc(*out, len+1)))
+		return -1;
+
+	strncpy(s, in, len);
+	s[len] = 0;
+
+	*out = s;
+
+	return len;
+}
+
+
+int
+cstuff_sprintf(char **out, const char *format, ...)
+{
+	int result;
+	va_list vl;
+
+	va_start(vl, format);
+	result = cstuff_vsprintf(out, format, vl);
+	va_end(vl);
+
+	return result;
+}
+
+
+int
+cstuff_vsprintf(char **out, const char *format, va_list args)
+{
+	int result;
+	va_list vc;
+	char tmp, *s;
+
+	va_copy(vc, args);
+	result = vsnprintf(&tmp, 1, format, vc);
+	va_end(vc);
+
+	if (!(s = malloc(result + 1)))
+		return -1;
+
+	*out = s;
+	result = vsnprintf(s, result+1, format, args); 
+
+	return result;
+}
+