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/*

* Copyright (C) the libgit2 contributors. All rights reserved.

*

* This file is part of libgit2, distributed under the GNU GPL v2 with

* a Linking Exception. For full terms see the included COPYING file.

*/

#include "buf_text.h"

int git_buf_text_puts_escaped(

git_buf *buf,

const char *string,

const char *esc_chars,

const char *esc_with)

{

const char *scan;

size_t total = 0, esc_len = strlen(esc_with), count;

if (!string)

return 0;

for (scan = string; *scan; ) {

/* count run of non-escaped characters */

count = strcspn(scan, esc_chars);

total += count;

scan += count;

/* count run of escaped characters */

count = strspn(scan, esc_chars);

total += count * (esc_len + 1);

scan += count;

}

if (git_buf_grow(buf, buf->size + total + 1) < 0)

return -1;

for (scan = string; *scan; ) {

count = strcspn(scan, esc_chars);

memmove(buf->ptr + buf->size, scan, count);

scan += count;

buf->size += count;

for (count = strspn(scan, esc_chars); count > 0; --count) {

/* copy escape sequence */

memmove(buf->ptr + buf->size, esc_with, esc_len);

buf->size += esc_len;

/* copy character to be escaped */

buf->ptr[buf->size] = *scan;

buf->size++;

scan++;

}

}

buf->ptr[buf->size] = '\0';

return 0;

}

void git_buf_text_unescape(git_buf *buf)

{

buf->size = git__unescape(buf->ptr);

}

int git_buf_text_crlf_to_lf(git_buf *tgt, const git_buf *src)

{

const char *scan = src->ptr;

const char *scan_end = src->ptr + src->size;

const char *next = memchr(scan, '\r', src->size);

char *out;

assert(tgt != src);

if (!next)

return GIT_ENOTFOUND;

/* reduce reallocs while in the loop */

if (git_buf_grow(tgt, src->size) < 0)

return -1;

out = tgt->ptr;

tgt->size = 0;

/* Find the next \r and copy whole chunk up to there to tgt */

for (; next; scan = next + 1, next = memchr(scan, '\r', scan_end - scan)) {

if (next > scan) {

size_t copylen = next - scan;

memcpy(out, scan, copylen);

out += copylen;

}

/* Do not drop \r unless it is followed by \n */

if (next[1] != '\n')

*out++ = '\r';

}

/* Copy remaining input into dest */

memcpy(out, scan, scan_end - scan + 1); /* +1 for NUL byte */

out += (scan_end - scan);

tgt->size = out - tgt->ptr;

return 0;

}

int git_buf_text_lf_to_crlf(git_buf *tgt, const git_buf *src)

{

const char *start = src->ptr;

const char *end = start + src->size;

const char *scan = start;

const char *next = memchr(scan, '\n', src->size);

assert(tgt != src);

if (!next)

return GIT_ENOTFOUND;

/* attempt to reduce reallocs while in the loop */

if (git_buf_grow(tgt, src->size + (src->size >> 4) + 1) < 0)

return -1;

tgt->size = 0;

for (; next; scan = next + 1, next = memchr(scan, '\n', end - scan)) {

size_t copylen = next - scan;

/* don't convert existing \r\n to \r\r\n */

size_t extralen = (next > start && next[-1] == '\r') ? 1 : 2;

size_t needsize = tgt->size + copylen + extralen + 1;

if (tgt->asize < needsize && git_buf_grow(tgt, needsize) < 0)

return -1;

if (next > scan) {

memcpy(tgt->ptr + tgt->size, scan, copylen);

tgt->size += copylen;

}

if (extralen == 2)

tgt->ptr[tgt->size++] = '\r';

tgt->ptr[tgt->size++] = '\n';

}

return git_buf_put(tgt, scan, end - scan);

}

int git_buf_text_common_prefix(git_buf *buf, const git_strarray *strings)

{

size_t i;

const char *str, *pfx;

git_buf_clear(buf);

if (!strings || !strings->count)

return 0;

/* initialize common prefix to first string */

if (git_buf_sets(buf, strings->strings[0]) < 0)

return -1;

/* go through the rest of the strings, truncating to shared prefix */

for (i = 1; i < strings->count; ++i) {

for (str = strings->strings[i], pfx = buf->ptr;

*str && *str == *pfx; str++, pfx++)

/* scanning */;

git_buf_truncate(buf, pfx - buf->ptr);

if (!buf->size)

break;

}

return 0;

}

bool git_buf_text_is_binary(const git_buf *buf)

{

const char *scan = buf->ptr, *end = buf->ptr + buf->size;

int printable = 0, nonprintable = 0;

while (scan < end) {

unsigned char c = *scan++;

if (c > 0x1F && c < 0x7F)

printable++;

else if (c == '\0')

return true;

else if (!git__isspace(c))

nonprintable++;

}

return ((printable >> 7) < nonprintable);

}

bool git_buf_text_contains_nul(const git_buf *buf)

{

return (memchr(buf->ptr, '\0', buf->size) != NULL);

}

int git_buf_text_detect_bom(git_bom_t *bom, const git_buf *buf, size_t offset)

{

const char *ptr;

size_t len;

*bom = GIT_BOM_NONE;

/* need at least 2 bytes after offset to look for any BOM */

if (buf->size < offset + 2)

return 0;

ptr = buf->ptr + offset;

len = buf->size - offset;

switch (*ptr++) {

case 0:

if (len >= 4 && ptr[0] == 0 && ptr[1] == '\xFE' && ptr[2] == '\xFF') {

*bom = GIT_BOM_UTF32_BE;

return 4;

}

break;

case '\xEF':

if (len >= 3 && ptr[0] == '\xBB' && ptr[1] == '\xBF') {

*bom = GIT_BOM_UTF8;

return 3;

}

break;

case '\xFE':

if (*ptr == '\xFF') {

*bom = GIT_BOM_UTF16_BE;

return 2;

}

break;

case '\xFF':

if (*ptr != '\xFE')

break;

if (len >= 4 && ptr[1] == 0 && ptr[2] == 0) {

*bom = GIT_BOM_UTF32_LE;

return 4;

} else {

*bom = GIT_BOM_UTF16_LE;

return 2;

}

break;

default:

break;

}

return 0;

}

bool git_buf_text_gather_stats(

git_buf_text_stats *stats, const git_buf *buf, bool skip_bom)

{

const char *scan = buf->ptr, *end = buf->ptr + buf->size;

int skip;

memset(stats, 0, sizeof(*stats));

/* BOM detection */

skip = git_buf_text_detect_bom(&stats->bom, buf, 0);

if (skip_bom)

scan += skip;

/* Ignore EOF character */

if (buf->size > 0 && end[-1] == '\032')

end--;

/* Counting loop */

while (scan < end) {

unsigned char c = *scan++;

if ((c > 0x1F && c < 0x7F) || c > 0x9f)

stats->printable++;

else switch (c) {

case '\0':

stats->nul++;

stats->nonprintable++;

break;

case '\n':

stats->lf++;

break;

case '\r':

stats->cr++;

if (scan < end && *scan == '\n')

stats->crlf++;

break;

case '\t': case '\f': case '\v': case '\b': case 0x1b: /*ESC*/

stats->printable++;

break;

default:

stats->nonprintable++;

break;

}

}

return (stats->nul > 0 ||

((stats->printable >> 7) < stats->nonprintable));

}