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git/builtin/cat-file.c
Ramsay Jones 803a777942 cat-file: Fix an gcc -Wuninitialized warning
After commit cbfd5e1c ("drop some obsolete "x = x" compiler warning
hacks", 21-03-2013) removed a gcc specific hack, older versions of
gcc now issue an "'contents' might be used uninitialized" warning.
In order to suppress the warning, we simply initialize the variable
to NULL in it's declaration.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-03-29 23:47:00 -07:00

311 lines
7.2 KiB
C

/*
* GIT - The information manager from hell
*
* Copyright (C) Linus Torvalds, 2005
*/
#include "cache.h"
#include "exec_cmd.h"
#include "tag.h"
#include "tree.h"
#include "builtin.h"
#include "parse-options.h"
#include "diff.h"
#include "userdiff.h"
#include "streaming.h"
#define BATCH 1
#define BATCH_CHECK 2
static void pprint_tag(const unsigned char *sha1, const char *buf, unsigned long size)
{
/* the parser in tag.c is useless here. */
const char *endp = buf + size;
const char *cp = buf;
while (cp < endp) {
char c = *cp++;
if (c != '\n')
continue;
if (7 <= endp - cp && !memcmp("tagger ", cp, 7)) {
const char *tagger = cp;
/* Found the tagger line. Copy out the contents
* of the buffer so far.
*/
write_or_die(1, buf, cp - buf);
/*
* Do something intelligent, like pretty-printing
* the date.
*/
while (cp < endp) {
if (*cp++ == '\n') {
/* tagger to cp is a line
* that has ident and time.
*/
const char *sp = tagger;
char *ep;
unsigned long date;
long tz;
while (sp < cp && *sp != '>')
sp++;
if (sp == cp) {
/* give up */
write_or_die(1, tagger,
cp - tagger);
break;
}
while (sp < cp &&
!('0' <= *sp && *sp <= '9'))
sp++;
write_or_die(1, tagger, sp - tagger);
date = strtoul(sp, &ep, 10);
tz = strtol(ep, NULL, 10);
sp = show_date(date, tz, 0);
write_or_die(1, sp, strlen(sp));
xwrite(1, "\n", 1);
break;
}
}
break;
}
if (cp < endp && *cp == '\n')
/* end of header */
break;
}
/* At this point, we have copied out the header up to the end of
* the tagger line and cp points at one past \n. It could be the
* next header line after the tagger line, or it could be another
* \n that marks the end of the headers. We need to copy out the
* remainder as is.
*/
if (cp < endp)
write_or_die(1, cp, endp - cp);
}
static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
{
unsigned char sha1[20];
enum object_type type;
char *buf;
unsigned long size;
struct object_context obj_context;
if (get_sha1_with_context(obj_name, 0, sha1, &obj_context))
die("Not a valid object name %s", obj_name);
buf = NULL;
switch (opt) {
case 't':
type = sha1_object_info(sha1, NULL);
if (type > 0) {
printf("%s\n", typename(type));
return 0;
}
break;
case 's':
type = sha1_object_info(sha1, &size);
if (type > 0) {
printf("%lu\n", size);
return 0;
}
break;
case 'e':
return !has_sha1_file(sha1);
case 'p':
type = sha1_object_info(sha1, NULL);
if (type < 0)
die("Not a valid object name %s", obj_name);
/* custom pretty-print here */
if (type == OBJ_TREE) {
const char *ls_args[3] = { NULL };
ls_args[0] = "ls-tree";
ls_args[1] = obj_name;
return cmd_ls_tree(2, ls_args, NULL);
}
if (type == OBJ_BLOB)
return stream_blob_to_fd(1, sha1, NULL, 0);
buf = read_sha1_file(sha1, &type, &size);
if (!buf)
die("Cannot read object %s", obj_name);
if (type == OBJ_TAG) {
pprint_tag(sha1, buf, size);
return 0;
}
/* otherwise just spit out the data */
break;
case 'c':
if (!obj_context.path[0])
die("git cat-file --textconv %s: <object> must be <sha1:path>",
obj_name);
if (!textconv_object(obj_context.path, obj_context.mode, sha1, 1, &buf, &size))
die("git cat-file --textconv: unable to run textconv on %s",
obj_name);
break;
case 0:
if (type_from_string(exp_type) == OBJ_BLOB) {
unsigned char blob_sha1[20];
if (sha1_object_info(sha1, NULL) == OBJ_TAG) {
enum object_type type;
unsigned long size;
char *buffer = read_sha1_file(sha1, &type, &size);
if (memcmp(buffer, "object ", 7) ||
get_sha1_hex(buffer + 7, blob_sha1))
die("%s not a valid tag", sha1_to_hex(sha1));
free(buffer);
} else
hashcpy(blob_sha1, sha1);
if (sha1_object_info(blob_sha1, NULL) == OBJ_BLOB)
return stream_blob_to_fd(1, blob_sha1, NULL, 0);
/*
* we attempted to dereference a tag to a blob
* and failed; there may be new dereference
* mechanisms this code is not aware of.
* fall-back to the usual case.
*/
}
buf = read_object_with_reference(sha1, exp_type, &size, NULL);
break;
default:
die("git cat-file: unknown option: %s", exp_type);
}
if (!buf)
die("git cat-file %s: bad file", obj_name);
write_or_die(1, buf, size);
return 0;
}
static int batch_one_object(const char *obj_name, int print_contents)
{
unsigned char sha1[20];
enum object_type type = 0;
unsigned long size;
void *contents = NULL;
if (!obj_name)
return 1;
if (get_sha1(obj_name, sha1)) {
printf("%s missing\n", obj_name);
fflush(stdout);
return 0;
}
if (print_contents == BATCH)
contents = read_sha1_file(sha1, &type, &size);
else
type = sha1_object_info(sha1, &size);
if (type <= 0) {
printf("%s missing\n", obj_name);
fflush(stdout);
if (print_contents == BATCH)
free(contents);
return 0;
}
printf("%s %s %lu\n", sha1_to_hex(sha1), typename(type), size);
fflush(stdout);
if (print_contents == BATCH) {
write_or_die(1, contents, size);
printf("\n");
fflush(stdout);
free(contents);
}
return 0;
}
static int batch_objects(int print_contents)
{
struct strbuf buf = STRBUF_INIT;
while (strbuf_getline(&buf, stdin, '\n') != EOF) {
int error = batch_one_object(buf.buf, print_contents);
if (error)
return error;
}
return 0;
}
static const char * const cat_file_usage[] = {
N_("git cat-file (-t|-s|-e|-p|<type>|--textconv) <object>"),
N_("git cat-file (--batch|--batch-check) < <list_of_objects>"),
NULL
};
static int git_cat_file_config(const char *var, const char *value, void *cb)
{
if (userdiff_config(var, value) < 0)
return -1;
return git_default_config(var, value, cb);
}
int cmd_cat_file(int argc, const char **argv, const char *prefix)
{
int opt = 0, batch = 0;
const char *exp_type = NULL, *obj_name = NULL;
const struct option options[] = {
OPT_GROUP(N_("<type> can be one of: blob, tree, commit, tag")),
OPT_SET_INT('t', NULL, &opt, N_("show object type"), 't'),
OPT_SET_INT('s', NULL, &opt, N_("show object size"), 's'),
OPT_SET_INT('e', NULL, &opt,
N_("exit with zero when there's no error"), 'e'),
OPT_SET_INT('p', NULL, &opt, N_("pretty-print object's content"), 'p'),
OPT_SET_INT(0, "textconv", &opt,
N_("for blob objects, run textconv on object's content"), 'c'),
OPT_SET_INT(0, "batch", &batch,
N_("show info and content of objects fed from the standard input"),
BATCH),
OPT_SET_INT(0, "batch-check", &batch,
N_("show info about objects fed from the standard input"),
BATCH_CHECK),
OPT_END()
};
git_config(git_cat_file_config, NULL);
if (argc != 3 && argc != 2)
usage_with_options(cat_file_usage, options);
argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0);
if (opt) {
if (argc == 1)
obj_name = argv[0];
else
usage_with_options(cat_file_usage, options);
}
if (!opt && !batch) {
if (argc == 2) {
exp_type = argv[0];
obj_name = argv[1];
} else
usage_with_options(cat_file_usage, options);
}
if (batch && (opt || argc)) {
usage_with_options(cat_file_usage, options);
}
if (batch)
return batch_objects(batch);
return cat_one_file(opt, exp_type, obj_name);
}