#include "cache.h"

#include "config.h"

#include "object-store.h"

#include "xdiff-interface.h"

#include "xdiff/xtypes.h"

#include "xdiff/xdiffi.h"

#include "xdiff/xemit.h"

#include "xdiff/xmacros.h"

#include "xdiff/xutils.h"

struct xdiff_emit_state {

};

static int xdiff_out_hunk(void *priv_,

long old_begin, long old_nr,

long new_begin, long new_nr,

const char *func, long funclen)

{

struct xdiff_emit_state *priv = priv_;

if (priv->remainder.len)

BUG("xdiff emitted hunk in the middle of a line");

priv->hunk_fn(priv->consume_callback_data,

old_begin, old_nr, new_begin, new_nr,

func, funclen);

return 0;

}

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->line_fn(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;

if (!priv->line_fn)

return 0;

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 end on a complete line.

*/

static void trim_common_tail(mmfile_t *a, mmfile_t *b)

{

const int blk = 1024;

long trimmed = 0, recovered = 0;

char *ap = a->size ? a->ptr + a->size : a->ptr;

char *bp = b->size ? b->ptr + b->size : b->ptr;

long smaller = (a->size < b->size) ? a->size : b->size;

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;

if (mf1->size > MAX_XDIFF_SIZE || mf2->size > MAX_XDIFF_SIZE)

return -1;

if (!xecfg->ctxlen && !(xecfg->flags & XDL_EMIT_FUNCCONTEXT))

trim_common_tail(&a, &b);

return xdl_diff(&a, &b, xpp, xecfg, xecb);

}

void discard_hunk_line(void *priv,

long ob, long on, long nb, long nn,

const char *func, long funclen)

{

}

int xdi_diff_outf(mmfile_t *mf1, mmfile_t *mf2,

xpparam_t const *xpp, xdemitconf_t const *xecfg)

{

int ret;

struct xdiff_emit_state state;

xdemitcb_t ecb;

memset(&state, 0, sizeof(state));

state.hunk_fn = hunk_fn;

state.line_fn = line_fn;

state.consume_callback_data = consume_callback_data;

memset(&ecb, 0, sizeof(ecb));

if (hunk_fn)

ecb.out_hunk = xdiff_out_hunk;

ecb.out_line = xdiff_outf;

ecb.priv = &state;

strbuf_init(&state.remainder, 0);

ret = xdi_diff(mf1, mf2, xpp, xecfg, &ecb);

strbuf_release(&state.remainder);

return ret;

}

int read_mmfile(mmfile_t *ptr, const char *filename)

{

struct stat st;

FILE *f;

size_t sz;

if (stat(filename, &st))

return error_errno("Could not stat %s", filename);

if ((f = fopen(filename, "rb")) == NULL)

return error_errno("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 struct object_id *oid)

{

unsigned long size;

enum object_type type;

if (oideq(oid, &null_oid)) {

ptr->ptr = xstrdup("");

ptr->size = 0;

return;

}

ptr->ptr = read_object_file(oid, &type, &size);

if (!ptr->ptr || type != OBJ_BLOB)

die("unable to read blob object %s", oid_to_hex(oid));

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 {

};

static long ff_regexp(const char *line, long len,

char *buffer, long buffer_size, void *priv)

{

struct ff_regs *regs = priv;

regmatch_t pmatch[2];

int i;

int result;

/* 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--;

}

for (i = 0; i < regs->nr; i++) {

struct ff_reg *reg = regs->array + i;

if (!regexec_buf(&reg->re, line, len, 2, pmatch, 0)) {

if (reg->negate)

return -1;

break;

}

}

if (regs->nr <= i)

return -1;

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);

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++;

ALLOC_ARRAY(regs->array, regs->nr);

for (i = 0; i < regs->nr; i++) {

struct ff_reg *reg = regs->array + i;

const char *ep, *expression;

char *buffer = NULL;

if (!value)

BUG("mismatch between line count and parsing");

ep = strchr(value, '\n');

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 ? ep + 1 : NULL;

}

}

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;

}

}

unsigned long xdiff_hash_string(const char *s, size_t len, long flags)

{

return xdl_hash_record(&s, s + len, flags);

}

int xdiff_compare_lines(const char *l1, long s1,

const char *l2, long s2, long flags)

{

return xdl_recmatch(l1, s1, l2, s2, flags);

}

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;

/*

* Please update _git_checkout() in

* git-completion.bash when you add new merge config

*/

else

die("unknown style '%s' given for '%s'",

value, var);

return 0;

}

return git_default_config(var, value, cb);

}