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83c4d38017
The previous commit enforces MAX_XDIFF_SIZE at the interfaces to xdiff: xdi_diff (which calls xdl_diff) and ll_xdl_merge (which calls xdl_merge). But we have another direct call to xdl_merge in merge-file.c. If it were written today, this probably would just use the ll_merge machinery. But it predates that code, and uses slightly different options to xdl_merge (e.g., ZEALOUS_ALNUM). We could try to abstract out an xdi_merge to match the existing xdi_diff, but even that is difficult. Rather than simply report error, we try to treat large files as binary, and that distinction would happen outside of xdi_merge. The simplest fix is to just replicate the MAX_XDIFF_SIZE check in merge-file.c. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
#include "builtin.h"
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#include "cache.h"
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#include "xdiff/xdiff.h"
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#include "xdiff-interface.h"
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#include "parse-options.h"
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static const char *const merge_file_usage[] = {
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N_("git merge-file [options] [-L name1 [-L orig [-L name2]]] file1 orig_file file2"),
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NULL
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};
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static int label_cb(const struct option *opt, const char *arg, int unset)
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{
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static int label_count = 0;
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const char **names = (const char **)opt->value;
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if (label_count >= 3)
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return error("too many labels on the command line");
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names[label_count++] = arg;
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return 0;
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}
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int cmd_merge_file(int argc, const char **argv, const char *prefix)
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{
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const char *names[3] = { NULL, NULL, NULL };
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mmfile_t mmfs[3];
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mmbuffer_t result = {NULL, 0};
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xmparam_t xmp = {{0}};
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int ret = 0, i = 0, to_stdout = 0;
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int quiet = 0;
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int prefixlen = 0;
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struct option options[] = {
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OPT_BOOL('p', "stdout", &to_stdout, N_("send results to standard output")),
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OPT_SET_INT(0, "diff3", &xmp.style, N_("use a diff3 based merge"), XDL_MERGE_DIFF3),
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OPT_SET_INT(0, "ours", &xmp.favor, N_("for conflicts, use our version"),
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XDL_MERGE_FAVOR_OURS),
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OPT_SET_INT(0, "theirs", &xmp.favor, N_("for conflicts, use their version"),
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XDL_MERGE_FAVOR_THEIRS),
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OPT_SET_INT(0, "union", &xmp.favor, N_("for conflicts, use a union version"),
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XDL_MERGE_FAVOR_UNION),
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OPT_INTEGER(0, "marker-size", &xmp.marker_size,
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N_("for conflicts, use this marker size")),
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OPT__QUIET(&quiet, N_("do not warn about conflicts")),
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OPT_CALLBACK('L', NULL, names, N_("name"),
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N_("set labels for file1/orig_file/file2"), &label_cb),
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OPT_END(),
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};
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xmp.level = XDL_MERGE_ZEALOUS_ALNUM;
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xmp.style = 0;
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xmp.favor = 0;
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if (startup_info->have_repository) {
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/* Read the configuration file */
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git_config(git_xmerge_config, NULL);
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if (0 <= git_xmerge_style)
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xmp.style = git_xmerge_style;
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}
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argc = parse_options(argc, argv, prefix, options, merge_file_usage, 0);
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if (argc != 3)
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usage_with_options(merge_file_usage, options);
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if (quiet) {
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if (!freopen("/dev/null", "w", stderr))
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return error("failed to redirect stderr to /dev/null: "
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"%s", strerror(errno));
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}
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if (prefix)
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prefixlen = strlen(prefix);
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for (i = 0; i < 3; i++) {
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const char *fname = prefix_filename(prefix, prefixlen, argv[i]);
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if (!names[i])
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names[i] = argv[i];
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if (read_mmfile(mmfs + i, fname))
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return -1;
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if (mmfs[i].size > MAX_XDIFF_SIZE ||
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buffer_is_binary(mmfs[i].ptr, mmfs[i].size))
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return error("Cannot merge binary files: %s",
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argv[i]);
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}
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xmp.ancestor = names[1];
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xmp.file1 = names[0];
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xmp.file2 = names[2];
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ret = xdl_merge(mmfs + 1, mmfs + 0, mmfs + 2, &xmp, &result);
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for (i = 0; i < 3; i++)
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free(mmfs[i].ptr);
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if (ret >= 0) {
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const char *filename = argv[0];
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const char *fpath = prefix_filename(prefix, prefixlen, argv[0]);
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FILE *f = to_stdout ? stdout : fopen(fpath, "wb");
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if (!f)
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ret = error("Could not open %s for writing", filename);
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else if (result.size &&
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fwrite(result.ptr, result.size, 1, f) != 1)
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ret = error("Could not write to %s", filename);
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else if (fclose(f))
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ret = error("Could not close %s", filename);
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free(result.ptr);
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}
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return ret;
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}
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