[cstring.h] Converting to header only lib

include/toolbox/cstring.h

@@ -1,5 +1,11 @@
-#ifndef TOOLBOX_CSTRING_H
-#define TOOLBOX_CSTRING_H
+#ifndef CSTRING_H
+#define CSTRING_H
+
+/* CSTRING RETURN CODE */
+#define CSTRING_RC_TYPE unsigned char
+extern __thread CSTRING_RC_TYPE logger_errno;
+#define CSTRING_RC_OK   ((CSTRING_RC_TYPE) 0L) /* No Error */
+#define CSTRING_RC_EVN  ((CSTRING_RC_TYPE) 1L) /* Value is Null */
 
 #include <stddef.h>
 
@@ -11,4 +17,64 @@ __attribute__((__pure__))
 _Bool
 cstring_equal(const char *restrict cstring_1, const char *restrict cstring_2);
 
-#endif
+#define IMPLEMENTATIONS
+#if defined(CSTRING_IMP) || defined(IMPLEMENTATIONS)
+
+#include <stddef.h>
+#include <stdlib.h>
+
+#if defined(CSTRING_LOG) || defined(LOGS)
+  #define __LOG(OUT, PFX, TXT) fprintf(OUT, PFX" %s: %s", __func__, TXT)
+  #define LOG_ERROR(TXT) __LOG(stderr, "[ERROR]", TXT)
+#else
+  #define LOG_ERROR(TXT) ;
+#endif	/* CSTRING_LOG */
+
+#define true  ((unsigned char) 1L)
+#define false ((unsigned char) 0L)
+
+#define TEST_FOR_NULL(POINTER)						\
+	if ( POINTER == NULL ) {					\
+		LOG_ERROR("Null Pointer Not Expected");		\
+		logger_errno = CSTRING_RC_EVN;				\
+		return logger_errno;					\
+	}
+
+size_t
+cstring_len(const char *p_cstr) {
+	TEST_FOR_NULL(p_cstr);
+	size_t len = 0;
+	while ( *(p_cstr + len++) ) {}
+	return --len;
+}
+
+_Bool
+cstring_equal(const char *restrict p_cstr1, const char *restrict p_cstr2) {
+	TEST_FOR_NULL(p_cstr1);
+	TEST_FOR_NULL(p_cstr2);
+
+	const size_t cstr1_size = cstring_len(p_cstr1);
+	const size_t cstr2_size = cstring_len(p_cstr2);
+
+	if ( cstr1_size != cstr2_size ) {
+		return false;
+	}
+
+	for ( size_t i = 0; i < cstr1_size; ++i ) {
+		if ( p_cstr1[i] != p_cstr2[i] ) {
+			return false;
+		}
+	}
+
+	return true;
+}
+
+#undef true
+#undef false
+
+#undef LOG_ERROR
+#undef TEST_FOR_NULL
+
+#endif /* CSTRING_IMP || IMPLEMENTATIONS */
+
+#endif	/* CSTRING_H */

src/toolbox/cstring.c

@@ -1,38 +0,0 @@
-#include "toolbox/cstring.h"
-#include "toolbox/log.h"
-
-#include <stdbool.h>
-#include <stddef.h>
-#include <stdlib.h>
-
-#define TEST_FOR_NULL(POINTER)											\
-	if ( POINTER == NULL )												\
-		{																\
-			LOG_ERROR("Null Pointer Not Expected");					\
-			exit(EXIT_FAILURE);										\
-		}
-
-size_t
-cstring_len(const char *p_cstr) {
-	TEST_FOR_NULL(p_cstr);
-	size_t len = 0;
-	while ( *(p_cstr + len++) ) {}
-	return --len;
-}
-
-bool
-cstring_equal(const char *restrict p_cstr1, const char *restrict p_cstr2) {
-	const size_t cstr1_size = cstring_len(p_cstr1);
-	const size_t cstr2_size = cstring_len(p_cstr2);
-	if ( cstr1_size != cstr2_size ) {
-		return false;
-	}
-	for ( size_t i = 0; i < cstr1_size; ++i ) {
-		if ( p_cstr1[i] != p_cstr2[i] ) {
-			return false;
-		}
-	}
-	return true;
-}
-
-#undef TEST_FOR_NULL