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Revision ec445074e0ac4d6003acd21c512c43c8fdb8be86 authored by Junio C Hamano on 12 March 2014, 18:04:11 UTC, committed by Junio C Hamano on 13 March 2014, 21:22:20 UTC 
request-pull: documentation updates
 
The original description talked only about what it does.  Instead,
start it with the purpose of the command, i.e. what it is used for,
and then mention what it does to achieve that goal.

Clarify what <start>, <url> and <end> means in the context of the
overall purpose of the command.

Describe the extended syntax of <end> parameter that is used when
the local branch name is different from the branch name at the
repository the changes are published.

Helped-by: Eric Sunshine
Signed-off-by: Junio C Hamano <gitster@pobox.com>
1 parent 5aae66b
Raw File
show-index.c 
#include "cache.h"
#include "pack.h"

static const char show_index_usage[] =
"git show-index < <packed archive index>";

int main(int argc, char **argv)
{
	int i;
	unsigned nr;
	unsigned int version;
	static unsigned int top_index[256];

	git_setup_gettext();

	if (argc != 1)
		usage(show_index_usage);
	if (fread(top_index, 2 * 4, 1, stdin) != 1)
		die("unable to read header");
	if (top_index[0] == htonl(PACK_IDX_SIGNATURE)) {
		version = ntohl(top_index[1]);
		if (version < 2 || version > 2)
			die("unknown index version");
		if (fread(top_index, 256 * 4, 1, stdin) != 1)
			die("unable to read index");
	} else {
		version = 1;
		if (fread(&top_index[2], 254 * 4, 1, stdin) != 1)
			die("unable to read index");
	}
	nr = 0;
	for (i = 0; i < 256; i++) {
		unsigned n = ntohl(top_index[i]);
		if (n < nr)
			die("corrupt index file");
		nr = n;
	}
	if (version == 1) {
		for (i = 0; i < nr; i++) {
			unsigned int offset, entry[6];

			if (fread(entry, 4 + 20, 1, stdin) != 1)
				die("unable to read entry %u/%u", i, nr);
			offset = ntohl(entry[0]);
			printf("%u %s\n", offset, sha1_to_hex((void *)(entry+1)));
		}
	} else {
		unsigned off64_nr = 0;
		struct {
			unsigned char sha1[20];
			uint32_t crc;
			uint32_t off;
		} *entries = xmalloc(nr * sizeof(entries[0]));
		for (i = 0; i < nr; i++)
			if (fread(entries[i].sha1, 20, 1, stdin) != 1)
				die("unable to read sha1 %u/%u", i, nr);
		for (i = 0; i < nr; i++)
			if (fread(&entries[i].crc, 4, 1, stdin) != 1)
				die("unable to read crc %u/%u", i, nr);
		for (i = 0; i < nr; i++)
			if (fread(&entries[i].off, 4, 1, stdin) != 1)
				die("unable to read 32b offset %u/%u", i, nr);
		for (i = 0; i < nr; i++) {
			uint64_t offset;
			uint32_t off = ntohl(entries[i].off);
			if (!(off & 0x80000000)) {
				offset = off;
			} else {
				uint32_t off64[2];
				if ((off & 0x7fffffff) != off64_nr)
					die("inconsistent 64b offset index");
				if (fread(off64, 8, 1, stdin) != 1)
					die("unable to read 64b offset %u", off64_nr);
				offset = (((uint64_t)ntohl(off64[0])) << 32) |
						     ntohl(off64[1]);
				off64_nr++;
			}
			printf("%" PRIuMAX " %s (%08"PRIx32")\n",
			       (uintmax_t) offset,
			       sha1_to_hex(entries[i].sha1),
			       ntohl(entries[i].crc));
		}
		free(entries);
	}
	return 0;
}
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