scc

commit 272cfb4582a575c73add5b73055ea98741bee5d9
parent 077526434528bec1791fc554bcbec556a6c21088
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Fri, 24 Nov 2017 15:17:51 +0000

[lib/scc] Add rdarhdr()

This function reads a ar header from a FILE pointer.

Diffstat:
M
inc/ar.h
 | 
1
+
M
lib/scc/libdep.mk
 | 
1
+
A
lib/scc/rar.c
 | 
33
+++++++++++++++++++++++++++++++++

3 files changed, 35 insertions(+), 0 deletions(-)
diff --git a/inc/ar.h b/inc/ar.h
@@ -18,3 +18,4 @@ struct arhdr {
 
 extern int wrarhdr(FILE *fp, struct arhdr *hdr);
 extern int wrarfile(FILE *fp, struct arhdr *hdr);
+extern int rdarhdr(FILE *fp, struct arhdr *hdr);
diff --git a/lib/scc/libdep.mk b/lib/scc/libdep.mk
@@ -12,3 +12,4 @@ LIB-OBJ = $(LIBDIR)/debug.o \
           $(LIBDIR)/wmyro.o \
           $(LIBDIR)/rmyro.o \
           $(LIBDIR)/war.o \
+          $(LIBDIR)/rar.o \
diff --git a/lib/scc/rar.c b/lib/scc/rar.c
@@ -0,0 +1,33 @@
+static char sccsid[] = "@(#) ./lib/scc/rar.c";
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "../../inc/ar.h"
+
+int
+rdarhdr(FILE *fp, struct arhdr *hdr)
+{
+	char buf[ARHDR_SIZ+1];
+	size_t len;
+	int n;
+
+	if (!fgets(buf, sizeof(buf), fp))
+		return EOF;
+	if ((len = strlen(buf)) != ARHDR_SIZ ||
+	    buf[len-2] != '`' ||
+	    buf[len-1] != '\n') {
+		return EOF;
+	}
+
+	n = sscanf(buf, "%16s-%llu-%u-%u-%o-%llu",
+	           &hdr->name,
+	           &hdr->time,
+	           &hdr->uid, &hdr->gid,
+	           &hdr->mode,
+	           &hdr->size);
+	if (n != 6)
+		return EOF;
+	return (feof(fp)) ? EOF : 0;
+}