From c5f6f3db4a706c226ca3d2534157a4997a916248 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Thu, 27 Jul 2017 23:32:52 +0200
Subject: [PATCH] add elftype function

---
 README.md |  1 +
 elf.h     |  1 +
 print.c   |  4 ++--
 str.c     | 23 +++++++++++++++++++++++
 4 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 46a7b51..d071101 100644
--- a/README.md
+++ b/README.md
@@ -66,6 +66,7 @@ Functions
 int readelf(FILE *f, Fhdr *fp);
 uint8_t* readelfsection(FILE *f, char *name, uint64_t *size, Fhdr *fp);
 void freeelf(Fhdr *fp);
+char* elftype(uint16_t type);
 ```
 
 Example
diff --git a/elf.h b/elf.h
index f7a20ac..4bfb5b5 100644
--- a/elf.h
+++ b/elf.h
@@ -50,3 +50,4 @@ struct Fhdr {
 int readelf(FILE*, Fhdr*);
 uint8_t* readelfsection(FILE*, char*, uint64_t*, Fhdr*);
 void freeelf(Fhdr*);
+char* elftype(uint16_t);
diff --git a/print.c b/print.c
index 582f9b2..01930b0 100644
--- a/print.c
+++ b/print.c
@@ -13,7 +13,7 @@ printelf32ehdr(Elf32_Ehdr *e, Fhdr *fp)
 	printf("ident %.2x %c %c %c %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x\n",
 		e->ident[0], e->ident[1], e->ident[2], e->ident[3], e->ident[4], e->ident[5], e->ident[6], e->ident[7],
 		e->ident[8], e->ident[9], e->ident[10], e->ident[11], e->ident[12], e->ident[13], e->ident[14], e->ident[15]);
-	printf("type %u\n", e->type);
+	printf("type %s (0x%.4x)\n", elftype(e->type), e->type);
 	printf("machine %s (0x%.4x)\n", elfmachine(e->machine), e->machine);
 	printf("version %u\n", e->version);
 	printf("entry 0x%.8x\n", e->entry);
@@ -36,7 +36,7 @@ printelf64ehdr(Elf64_Ehdr *e, Fhdr *fp)
 	printf("ident %.2x %c %c %c %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x\n",
 		e->ident[0], e->ident[1], e->ident[2], e->ident[3], e->ident[4], e->ident[5], e->ident[6], e->ident[7],
 		e->ident[8], e->ident[9], e->ident[10], e->ident[11], e->ident[12], e->ident[13], e->ident[14], e->ident[15]);
-	printf("type %u\n", e->type);
+	printf("type %s (0x%.4x)\n", elftype(e->type), e->type);
 	printf("machine %s (0x%.4x)\n", elfmachine(e->machine), e->machine);
 	printf("version %u\n", e->version);
 	printf("entry 0x%.16" PRIx64 "\n", e->entry);
diff --git a/str.c b/str.c
index f27edf4..47e8fca 100644
--- a/str.c
+++ b/str.c
@@ -187,6 +187,29 @@ char *machinestr[] = {
 	[EM_RISCV] = "RISC-V"
 };
 
+char *typestr[] = {
+	[ET_NONE] = "No file type",
+	[ET_REL] = "Relocatable file",
+	[ET_EXEC] = "Executable file",
+	[ET_DYN] = "Shared object file",
+	[ET_CORE] = "Core file",
+};
+
+char*
+elftype(uint16_t type)
+{
+        if(type < nelem(typestr) && typestr[type])
+                return typestr[type];
+
+	if (type >= ET_LOOS && type <= ET_HIOS)
+		return "Operating system-specific";
+
+	if (type >= ET_LOPROC)
+		return "Processor-specific";
+
+        return "Unknown type";
+}
+
 char*
 elfmachine(uint16_t machine)
 {