mirror of
https://github.com/git/git.git
synced 2024-05-27 00:36:37 +02:00
33e8fc8740
The synopsys text and the usage string of subcommands that read list of things from the standard input are often shown like this: git gostak [--distim] < <list-of-doshes> This is problematic in a number of ways: * The way to use these commands is more often to feed them the output from another command, not feed them from a file. * Manual pages outside Git, commands that operate on the data read from the standard input, e.g "sort", "grep", "sed", etc., are not described with such a "< redirection-from-file" in their synopsys text. Our doing so introduces inconsistency. * We do not insist on where the output should go, by saying git gostak [--distim] < <list-of-doshes> > <output> * As it is our convention to enclose placeholders inside <braket>, the redirection operator followed by a placeholder filename becomes very hard to read, both in the documentation and in the help text. Let's clean them all up, after making sure that the documentation clearly describes the modes that take information from the standard input and what kind of things are expected on the input. [jc: stole example for fmt-merge-msg from Jonathan] Helped-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
#include "cache.h"
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#include "pack.h"
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static const char show_index_usage[] =
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"git show-index";
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int main(int argc, char **argv)
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{
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int i;
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unsigned nr;
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unsigned int version;
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static unsigned int top_index[256];
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git_setup_gettext();
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if (argc != 1)
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usage(show_index_usage);
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if (fread(top_index, 2 * 4, 1, stdin) != 1)
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die("unable to read header");
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if (top_index[0] == htonl(PACK_IDX_SIGNATURE)) {
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version = ntohl(top_index[1]);
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if (version < 2 || version > 2)
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die("unknown index version");
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if (fread(top_index, 256 * 4, 1, stdin) != 1)
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die("unable to read index");
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} else {
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version = 1;
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if (fread(&top_index[2], 254 * 4, 1, stdin) != 1)
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die("unable to read index");
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}
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nr = 0;
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for (i = 0; i < 256; i++) {
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unsigned n = ntohl(top_index[i]);
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if (n < nr)
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die("corrupt index file");
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nr = n;
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}
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if (version == 1) {
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for (i = 0; i < nr; i++) {
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unsigned int offset, entry[6];
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if (fread(entry, 4 + 20, 1, stdin) != 1)
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die("unable to read entry %u/%u", i, nr);
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offset = ntohl(entry[0]);
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printf("%u %s\n", offset, sha1_to_hex((void *)(entry+1)));
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}
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} else {
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unsigned off64_nr = 0;
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struct {
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unsigned char sha1[20];
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uint32_t crc;
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uint32_t off;
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} *entries = xmalloc(nr * sizeof(entries[0]));
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for (i = 0; i < nr; i++)
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if (fread(entries[i].sha1, 20, 1, stdin) != 1)
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die("unable to read sha1 %u/%u", i, nr);
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for (i = 0; i < nr; i++)
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if (fread(&entries[i].crc, 4, 1, stdin) != 1)
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die("unable to read crc %u/%u", i, nr);
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for (i = 0; i < nr; i++)
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if (fread(&entries[i].off, 4, 1, stdin) != 1)
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die("unable to read 32b offset %u/%u", i, nr);
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for (i = 0; i < nr; i++) {
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uint64_t offset;
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uint32_t off = ntohl(entries[i].off);
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if (!(off & 0x80000000)) {
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offset = off;
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} else {
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uint32_t off64[2];
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if ((off & 0x7fffffff) != off64_nr)
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die("inconsistent 64b offset index");
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if (fread(off64, 8, 1, stdin) != 1)
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die("unable to read 64b offset %u", off64_nr);
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offset = (((uint64_t)ntohl(off64[0])) << 32) |
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ntohl(off64[1]);
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off64_nr++;
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}
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printf("%" PRIuMAX " %s (%08"PRIx32")\n",
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(uintmax_t) offset,
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sha1_to_hex(entries[i].sha1),
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ntohl(entries[i].crc));
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}
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free(entries);
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}
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return 0;
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}
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