shithub: libtags

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readtags example: seek to the image offset and back

--- a/examples/readtags.c

+++ b/examples/readtags.c

@@ -42,10 +42,14 @@

 			return;

 		char *raw = malloc(size);

 		Aux *aux = ctx->aux;

-		if(read(aux->fd, raw, size) != size || (f != NULL && f(raw, &size) != 0)){

+		int prevoffset = lseek(aux->fd, 0, 1);

+		if(lseek(aux->fd, offset, 0) != offset ||

+		   read(aux->fd, raw, size) != size ||

+		   (f != NULL && f(raw, &size) != 0)){

 			fprintf(stderr, "failed to read the image\n");

 			exit(1);

 		}

+		lseek(aux->fd, prevoffset, 0);

 		write(1, raw, size);

 		exit(0);

 		return;

@@ -107,7 +111,8 @@

 	}

 	for(i = 1; i < argc; i++){

-		printf("*** %s\n", argv[i]);

+		if(!image)

+			printf("*** %s\n", argv[i]);

 		if((aux.fd = open(argv[i], O_RDONLY)) < 0)

 			perror("failed to open");

 		else{