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git/xdiff-interface.c
Jonathan Nieder 8c2be75fe1 add, merge, diff: do not use strcasecmp to compare config variable names
The config machinery already makes section and variable names
lowercase when parsing them, so using strcasecmp for comparison just
feels wasteful.  No noticeable change intended.

Noticed-by: Jay Soffian <jaysoffian@gmail.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-05-14 18:53:39 -07:00

363 lines
8.2 KiB
C

#include "cache.h"
#include "xdiff-interface.h"
#include "xdiff/xtypes.h"
#include "xdiff/xdiffi.h"
#include "xdiff/xemit.h"
#include "xdiff/xmacros.h"
struct xdiff_emit_state {
xdiff_emit_consume_fn consume;
void *consume_callback_data;
struct strbuf remainder;
};
static int parse_num(char **cp_p, int *num_p)
{
char *cp = *cp_p;
int num = 0;
while ('0' <= *cp && *cp <= '9')
num = num * 10 + *cp++ - '0';
if (!(cp - *cp_p))
return -1;
*cp_p = cp;
*num_p = num;
return 0;
}
int parse_hunk_header(char *line, int len,
int *ob, int *on,
int *nb, int *nn)
{
char *cp;
cp = line + 4;
if (parse_num(&cp, ob)) {
bad_line:
return error("malformed diff output: %s", line);
}
if (*cp == ',') {
cp++;
if (parse_num(&cp, on))
goto bad_line;
}
else
*on = 1;
if (*cp++ != ' ' || *cp++ != '+')
goto bad_line;
if (parse_num(&cp, nb))
goto bad_line;
if (*cp == ',') {
cp++;
if (parse_num(&cp, nn))
goto bad_line;
}
else
*nn = 1;
return -!!memcmp(cp, " @@", 3);
}
static void consume_one(void *priv_, char *s, unsigned long size)
{
struct xdiff_emit_state *priv = priv_;
char *ep;
while (size) {
unsigned long this_size;
ep = memchr(s, '\n', size);
this_size = (ep == NULL) ? size : (ep - s + 1);
priv->consume(priv->consume_callback_data, s, this_size);
size -= this_size;
s += this_size;
}
}
static int xdiff_outf(void *priv_, mmbuffer_t *mb, int nbuf)
{
struct xdiff_emit_state *priv = priv_;
int i;
for (i = 0; i < nbuf; i++) {
if (mb[i].ptr[mb[i].size-1] != '\n') {
/* Incomplete line */
strbuf_add(&priv->remainder, mb[i].ptr, mb[i].size);
continue;
}
/* we have a complete line */
if (!priv->remainder.len) {
consume_one(priv, mb[i].ptr, mb[i].size);
continue;
}
strbuf_add(&priv->remainder, mb[i].ptr, mb[i].size);
consume_one(priv, priv->remainder.buf, priv->remainder.len);
strbuf_reset(&priv->remainder);
}
if (priv->remainder.len) {
consume_one(priv, priv->remainder.buf, priv->remainder.len);
strbuf_reset(&priv->remainder);
}
return 0;
}
/*
* Trim down common substring at the end of the buffers,
* but leave at least ctx lines at the end.
*/
static void trim_common_tail(mmfile_t *a, mmfile_t *b, long ctx)
{
const int blk = 1024;
long trimmed = 0, recovered = 0;
char *ap = a->ptr + a->size;
char *bp = b->ptr + b->size;
long smaller = (a->size < b->size) ? a->size : b->size;
if (ctx)
return;
while (blk + trimmed <= smaller && !memcmp(ap - blk, bp - blk, blk)) {
trimmed += blk;
ap -= blk;
bp -= blk;
}
while (recovered < trimmed)
if (ap[recovered++] == '\n')
break;
a->size -= trimmed - recovered;
b->size -= trimmed - recovered;
}
int xdi_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp, xdemitconf_t const *xecfg, xdemitcb_t *xecb)
{
mmfile_t a = *mf1;
mmfile_t b = *mf2;
trim_common_tail(&a, &b, xecfg->ctxlen);
return xdl_diff(&a, &b, xpp, xecfg, xecb);
}
int xdi_diff_outf(mmfile_t *mf1, mmfile_t *mf2,
xdiff_emit_consume_fn fn, void *consume_callback_data,
xpparam_t const *xpp, xdemitconf_t const *xecfg)
{
int ret;
struct xdiff_emit_state state;
xdemitcb_t ecb;
memset(&state, 0, sizeof(state));
state.consume = fn;
state.consume_callback_data = consume_callback_data;
memset(&ecb, 0, sizeof(ecb));
ecb.outf = xdiff_outf;
ecb.priv = &state;
strbuf_init(&state.remainder, 0);
ret = xdi_diff(mf1, mf2, xpp, xecfg, &ecb);
strbuf_release(&state.remainder);
return ret;
}
struct xdiff_emit_hunk_state {
xdiff_emit_hunk_consume_fn consume;
void *consume_callback_data;
};
static int process_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
xdemitconf_t const *xecfg)
{
long s1, s2, same, p_next, t_next;
xdchange_t *xch, *xche;
struct xdiff_emit_hunk_state *state = ecb->priv;
xdiff_emit_hunk_consume_fn fn = state->consume;
void *consume_callback_data = state->consume_callback_data;
for (xch = xscr; xch; xch = xche->next) {
xche = xdl_get_hunk(xch, xecfg);
s1 = XDL_MAX(xch->i1 - xecfg->ctxlen, 0);
s2 = XDL_MAX(xch->i2 - xecfg->ctxlen, 0);
same = s2 + XDL_MAX(xch->i1 - s1, 0);
p_next = xche->i1 + xche->chg1;
t_next = xche->i2 + xche->chg2;
fn(consume_callback_data, same, p_next, t_next);
}
return 0;
}
int xdi_diff_hunks(mmfile_t *mf1, mmfile_t *mf2,
xdiff_emit_hunk_consume_fn fn, void *consume_callback_data,
xpparam_t const *xpp, xdemitconf_t *xecfg)
{
struct xdiff_emit_hunk_state state;
xdemitcb_t ecb;
memset(&state, 0, sizeof(state));
memset(&ecb, 0, sizeof(ecb));
state.consume = fn;
state.consume_callback_data = consume_callback_data;
xecfg->emit_func = (void (*)())process_diff;
ecb.priv = &state;
return xdi_diff(mf1, mf2, xpp, xecfg, &ecb);
}
int read_mmfile(mmfile_t *ptr, const char *filename)
{
struct stat st;
FILE *f;
size_t sz;
if (stat(filename, &st))
return error("Could not stat %s", filename);
if ((f = fopen(filename, "rb")) == NULL)
return error("Could not open %s", filename);
sz = xsize_t(st.st_size);
ptr->ptr = xmalloc(sz ? sz : 1);
if (sz && fread(ptr->ptr, sz, 1, f) != 1) {
fclose(f);
return error("Could not read %s", filename);
}
fclose(f);
ptr->size = sz;
return 0;
}
void read_mmblob(mmfile_t *ptr, const unsigned char *sha1)
{
unsigned long size;
enum object_type type;
if (!hashcmp(sha1, null_sha1)) {
ptr->ptr = xstrdup("");
ptr->size = 0;
return;
}
ptr->ptr = read_sha1_file(sha1, &type, &size);
if (!ptr->ptr || type != OBJ_BLOB)
die("unable to read blob object %s", sha1_to_hex(sha1));
ptr->size = size;
}
#define FIRST_FEW_BYTES 8000
int buffer_is_binary(const char *ptr, unsigned long size)
{
if (FIRST_FEW_BYTES < size)
size = FIRST_FEW_BYTES;
return !!memchr(ptr, 0, size);
}
struct ff_regs {
int nr;
struct ff_reg {
regex_t re;
int negate;
} *array;
};
static long ff_regexp(const char *line, long len,
char *buffer, long buffer_size, void *priv)
{
char *line_buffer;
struct ff_regs *regs = priv;
regmatch_t pmatch[2];
int i;
int result = -1;
/* Exclude terminating newline (and cr) from matching */
if (len > 0 && line[len-1] == '\n') {
if (len > 1 && line[len-2] == '\r')
len -= 2;
else
len--;
}
line_buffer = xstrndup(line, len); /* make NUL terminated */
for (i = 0; i < regs->nr; i++) {
struct ff_reg *reg = regs->array + i;
if (!regexec(&reg->re, line_buffer, 2, pmatch, 0)) {
if (reg->negate)
goto fail;
break;
}
}
if (regs->nr <= i)
goto fail;
i = pmatch[1].rm_so >= 0 ? 1 : 0;
line += pmatch[i].rm_so;
result = pmatch[i].rm_eo - pmatch[i].rm_so;
if (result > buffer_size)
result = buffer_size;
while (result > 0 && (isspace(line[result - 1])))
result--;
memcpy(buffer, line, result);
fail:
free(line_buffer);
return result;
}
void xdiff_set_find_func(xdemitconf_t *xecfg, const char *value, int cflags)
{
int i;
struct ff_regs *regs;
xecfg->find_func = ff_regexp;
regs = xecfg->find_func_priv = xmalloc(sizeof(struct ff_regs));
for (i = 0, regs->nr = 1; value[i]; i++)
if (value[i] == '\n')
regs->nr++;
regs->array = xmalloc(regs->nr * sizeof(struct ff_reg));
for (i = 0; i < regs->nr; i++) {
struct ff_reg *reg = regs->array + i;
const char *ep = strchr(value, '\n'), *expression;
char *buffer = NULL;
reg->negate = (*value == '!');
if (reg->negate && i == regs->nr - 1)
die("Last expression must not be negated: %s", value);
if (*value == '!')
value++;
if (ep)
expression = buffer = xstrndup(value, ep - value);
else
expression = value;
if (regcomp(&reg->re, expression, cflags))
die("Invalid regexp to look for hunk header: %s", expression);
free(buffer);
value = ep + 1;
}
}
void xdiff_clear_find_func(xdemitconf_t *xecfg)
{
if (xecfg->find_func) {
int i;
struct ff_regs *regs = xecfg->find_func_priv;
for (i = 0; i < regs->nr; i++)
regfree(&regs->array[i].re);
free(regs->array);
free(regs);
xecfg->find_func = NULL;
xecfg->find_func_priv = NULL;
}
}
int git_xmerge_style = -1;
int git_xmerge_config(const char *var, const char *value, void *cb)
{
if (!strcmp(var, "merge.conflictstyle")) {
if (!value)
die("'%s' is not a boolean", var);
if (!strcmp(value, "diff3"))
git_xmerge_style = XDL_MERGE_DIFF3;
else if (!strcmp(value, "merge"))
git_xmerge_style = 0;
else
die("unknown style '%s' given for '%s'",
value, var);
return 0;
}
return git_default_config(var, value, cb);
}