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107 lines
2.7 KiB
107 lines
2.7 KiB
20 years ago
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#include "cache.h"
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#include "diff.h"
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static char *diff_cmd = "diff -L 'k/%s' -L 'l/%s' ";
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static char *diff_opts = "-p -u";
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static char *diff_arg_forward = " - '%s'";
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static char *diff_arg_reverse = " '%s' -";
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void prepare_diff_cmd(void)
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{
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/*
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* Default values above are meant to match the
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* Linux kernel development style. Examples of
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* alternative styles you can specify via environment
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* variables are:
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*
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* GIT_DIFF_CMD="diff -L '%s' -L '%s'"
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* GIT_DIFF_OPTS="-c";
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*/
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diff_cmd = getenv("GIT_DIFF_CMD") ? : diff_cmd;
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diff_opts = getenv("GIT_DIFF_OPTS") ? : diff_opts;
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}
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/* Help to copy the thing properly quoted for the shell safety.
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* any single quote is replaced with '\'', and the caller is
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* expected to enclose the result within a single quote pair.
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*
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* E.g.
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* original sq_expand result
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* name ==> name ==> 'name'
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* a b ==> a b ==> 'a b'
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* a'b ==> a'\''b ==> 'a'\''b'
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*/
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static char *sq_expand(const char *src)
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{
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static char *buf = NULL;
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int cnt, c;
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const char *cp;
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char *bp;
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/* count bytes needed to store the quoted string. */
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for (cnt = 1, cp = src; *cp; cnt++, cp++)
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if (*cp == '\'')
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cnt += 3;
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if (! (buf = malloc(cnt)))
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return buf;
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bp = buf;
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while ((c = *src++)) {
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if (c != '\'')
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*bp++ = c;
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else {
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bp = strcpy(bp, "'\\''");
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bp += 4;
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}
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}
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*bp = 0;
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return buf;
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}
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void show_differences(const char *name, /* filename on the filesystem */
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const char *label, /* diff label to use */
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void *old_contents, /* contents in core */
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unsigned long long old_size, /* size in core */
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int reverse /* 0: diff core file
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1: diff file core */)
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{
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FILE *f;
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char *name_sq = sq_expand(name);
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const char *label_sq = (name != label) ? sq_expand(label) : name_sq;
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char *diff_arg = reverse ? diff_arg_reverse : diff_arg_forward;
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int cmd_size = strlen(name_sq) + strlen(label_sq) * 2 +
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strlen(diff_cmd) + strlen(diff_opts) + strlen(diff_arg);
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char *cmd = malloc(cmd_size);
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int next_at;
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fflush(stdout);
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next_at = snprintf(cmd, cmd_size, diff_cmd, label_sq, label_sq);
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next_at += snprintf(cmd+next_at, cmd_size-next_at, "%s", diff_opts);
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next_at += snprintf(cmd+next_at, cmd_size-next_at, diff_arg, name_sq);
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f = popen(cmd, "w");
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if (old_size)
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fwrite(old_contents, old_size, 1, f);
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pclose(f);
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if (label_sq != name_sq)
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free((void*)label_sq); /* constness */
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free(name_sq);
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free(cmd);
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}
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void show_diff_empty(const unsigned char *sha1,
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const char *name,
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int reverse)
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{
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char *old;
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unsigned long int size;
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unsigned char type[20];
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old = read_sha1_file(sha1, type, &size);
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if (! old) {
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error("unable to read blob object for %s (%s)", name,
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sha1_to_hex(sha1));
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return;
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}
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show_differences("/dev/null", name, old, size, reverse);
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}
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