Add minitar_rewind()

Makefile

@@ -6,7 +6,7 @@ SRC := src
 CC ?= gcc
 AR ?= ar
 CFLAGS ?= -O2 -Wall -Wextra
-CFLAGS := ${CFLAGS} -I. -D_IN_MINITAR
+CFLAGS := ${CFLAGS} -I.
 DESTDIR ?= /usr/local
 
 OBJS := $(OBJ)/tar.o \

README.md

@@ -59,6 +59,11 @@ This function returns NULL on end-of-file (when all entries have been read).
 
 Frees the heap-allocated `struct minitar_entry` and the file contents stored inside it. The pointer passed to `minitar_free_entry()` should be the return value of a previous call to `minitar_read_entry()`.
 
+### minitar_rewind
+`void minitar_rewind(struct minitar* mp)`
+
+Rewinds the `struct minitar` back to the beginning of the archive file, which means that the next call to `minitar_read_entry()` will return the first entry instead of the entry after the last read entry.
+
 ### minitar_close
 `int minitar_close(struct minitar* mp)`
 

minitar.h

@@ -1,9 +1,9 @@
 #ifndef MINITAR_H
 #define MINITAR_H
-#include <stdio.h>
 #include <sys/types.h>
 
 #ifdef _IN_MINITAR
+#include <stdio.h>
 struct minitar
 {
     FILE* stream;
@@ -42,6 +42,7 @@ struct minitar_entry
 struct minitar* minitar_open(const char* pathname);
 struct minitar_entry* minitar_read_entry(struct minitar* mp);
 void minitar_free_entry(struct minitar_entry* entry);
+void minitar_rewind(struct minitar* mp);
 int minitar_close(struct minitar* mp);
 
 #endif

src/tar.c

@@ -1,3 +1,4 @@
+#define _IN_MINITAR
 #include "tar.h"
 #include "minitar.h"
 #include <stdlib.h>
@@ -62,6 +63,11 @@ struct minitar_entry* minitar_read_entry(struct minitar* mp)
     return result;
 }
 
+void minitar_rewind(struct minitar* mp)
+{
+    rewind(mp->stream);
+}
+
 void minitar_free_entry(struct minitar_entry* entry)
 {
     free(entry->ptr);

src/util.c

@@ -1,4 +1,5 @@
-#define _POSIX_C_SOURCE 200809L
+#define _POSIX_C_SOURCE 200809L // for strndup
+#define _IN_MINITAR
 #include "minitar.h"
 #include "tar.h"
 #include <stdarg.h>