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crlf.c

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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 "common.h"

#include "fileops.h"

#include "hash.h"

#include "filter.h"

#include "repository.h"

#include "git2/attr.h"

struct crlf_attrs {

int crlf_action;

int eol;

};

struct crlf_filter {

git_filter f;

struct crlf_attrs attrs;

};

static int check_crlf(const char *value)

{

if (GIT_ATTR_TRUE(value))

return GIT_CRLF_TEXT;

if (GIT_ATTR_FALSE(value))

return GIT_CRLF_BINARY;

if (GIT_ATTR_UNSPECIFIED(value))

return GIT_CRLF_GUESS;

if (strcmp(value, "input") == 0)

return GIT_CRLF_INPUT;

if (strcmp(value, "auto") == 0)

return GIT_CRLF_AUTO;

return GIT_CRLF_GUESS;

}

static int check_eol(const char *value)

{

if (GIT_ATTR_UNSPECIFIED(value))

return GIT_EOL_UNSET;

if (strcmp(value, "lf") == 0)

return GIT_EOL_LF;

if (strcmp(value, "crlf") == 0)

return GIT_EOL_CRLF;

return GIT_EOL_UNSET;

}

static int crlf_input_action(struct crlf_attrs *ca)

{

if (ca->crlf_action == GIT_CRLF_BINARY)

return GIT_CRLF_BINARY;

if (ca->eol == GIT_EOL_LF)

return GIT_CRLF_INPUT;

if (ca->eol == GIT_EOL_CRLF)

return GIT_CRLF_CRLF;

return ca->crlf_action;

}

static int crlf_load_attributes(struct crlf_attrs *ca, git_repository *repo, const char *path)

{

#define NUM_CONV_ATTRS 3

static const char *attr_names[NUM_CONV_ATTRS] = {

"crlf", "eol", "text",

};

const char *attr_vals[NUM_CONV_ATTRS];

int error;

error = git_attr_get_many(attr_vals,

repo, 0, path, NUM_CONV_ATTRS, attr_names);

if (error == GIT_ENOTFOUND) {

ca->crlf_action = GIT_CRLF_GUESS;

ca->eol = GIT_EOL_UNSET;

return 0;

}

if (error == 0) {

ca->crlf_action = check_crlf(attr_vals[2]); /* text */

if (ca->crlf_action == GIT_CRLF_GUESS)

ca->crlf_action = check_crlf(attr_vals[0]); /* clrf */

ca->eol = check_eol(attr_vals[1]); /* eol */

return 0;

}

return -1;

}

static int drop_crlf(git_buf *dest, const git_buf *source)

{

const char *scan = source->ptr, *next;

const char *scan_end = git_buf_cstr(source) + git_buf_len(source);

/* Main scan loop. Find the next carriage return and copy the

* whole chunk up to that point to the destination buffer.

*/

while ((next = memchr(scan, '\r', scan_end - scan)) != NULL) {

/* copy input up to \r */

if (next > scan)

git_buf_put(dest, scan, next - scan);

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

if (*(next + 1) != '\n')

git_buf_putc(dest, '\r');

scan = next + 1;

}

/* If there was no \r, then tell the library to skip this filter */

if (scan == source->ptr)

return -1;

/* Copy remaining input into dest */

git_buf_put(dest, scan, scan_end - scan);

return 0;

}

static int crlf_apply_to_odb(git_filter *self, git_buf *dest, const git_buf *source)

{

struct crlf_filter *filter = (struct crlf_filter *)self;

assert(self && dest && source);

/* Empty file? Nothing to do */

if (git_buf_len(source) == 0)

return 0;

/* Heuristics to see if we can skip the conversion.

* Straight from Core Git.

*/

if (filter->attrs.crlf_action == GIT_CRLF_AUTO ||

filter->attrs.crlf_action == GIT_CRLF_GUESS) {

git_buf_text_stats stats;

/* Check heuristics for binary vs text... */

if (git_buf_text_gather_stats(&stats, source, false))

return -1;

/*

* We're currently not going to even try to convert stuff

* that has bare CR characters. Does anybody do that crazy

* stuff?

*/

if (stats.cr != stats.crlf)

return -1;

#if 0

if (crlf_action == CRLF_GUESS) {

/*

* If the file in the index has any CR in it, do not convert.

* This is the new safer autocrlf handling.

*/

if (has_cr_in_index(path))

return 0;

}

#endif

if (!stats.cr)

return -1;

}

/* Actually drop the carriage returns */

return drop_crlf(dest, source);

}

static int convert_line_endings(git_buf *dest, const git_buf *source, const char *ending)

{

const char *scan = git_buf_cstr(source),

*next,

*scan_end = git_buf_cstr(source) + git_buf_len(source);

while ((next = memchr(scan, '\n', scan_end - scan)) != NULL) {

if (next > scan)

git_buf_put(dest, scan, next-scan);

git_buf_puts(dest, ending);

scan = next + 1;

}

git_buf_put(dest, scan, scan_end - scan);

return 0;

}

static const char *line_ending(struct crlf_filter *filter)

{

switch (filter->attrs.crlf_action) {

case GIT_CRLF_BINARY:

case GIT_CRLF_INPUT:

return "\n";

case GIT_CRLF_CRLF:

return "\r\n";

case GIT_CRLF_AUTO:

case GIT_CRLF_TEXT:

case GIT_CRLF_GUESS:

break;

default:

goto line_ending_error;

}

switch (filter->attrs.eol) {

case GIT_EOL_UNSET:

return GIT_EOL_NATIVE == GIT_EOL_CRLF

? "\r\n"

: "\n";

case GIT_EOL_CRLF:

return "\r\n";

case GIT_EOL_LF:

return "\n";

default:

goto line_ending_error;

}

line_ending_error:

giterr_set(GITERR_INVALID, "Invalid input to line ending filter");

return NULL;

}

static int crlf_apply_to_workdir(git_filter *self, git_buf *dest, const git_buf *source)

{

struct crlf_filter *filter = (struct crlf_filter *)self;

const char *workdir_ending = NULL;

assert (self && dest && source);

/* Empty file? Nothing to do. */

if (git_buf_len(source) == 0)

return 0;

/* Determine proper line ending */

workdir_ending = line_ending(filter);

if (!workdir_ending) return -1;

/* If the line ending is '\n', just copy the input */

if (!strcmp(workdir_ending, "\n"))

return git_buf_puts(dest, git_buf_cstr(source));

return convert_line_endings(dest, source, workdir_ending);

}

static int find_and_add_filter(

git_vector *filters, git_repository *repo, const char *path,

int (*apply)(struct git_filter *self, git_buf *dest, const git_buf *source))

{

struct crlf_attrs ca;

struct crlf_filter *filter;

int error;

/* Load gitattributes for the path */

if ((error = crlf_load_attributes(&ca, repo, path)) < 0)

return error;

/*

* Use the core Git logic to see if we should perform CRLF for this file

* based on its attributes & the value of `core.autocrlf`

*/

ca.crlf_action = crlf_input_action(&ca);

if (ca.crlf_action == GIT_CRLF_BINARY)

return 0;

if (ca.crlf_action == GIT_CRLF_GUESS) {

int auto_crlf;

if ((error = git_repository__cvar(&auto_crlf, repo, GIT_CVAR_AUTO_CRLF)) < 0)

return error;

if (auto_crlf == GIT_AUTO_CRLF_FALSE)

return 0;

}

/* If we're good, we create a new filter object and push it

* into the filters array */

filter = git__malloc(sizeof(struct crlf_filter));

GITERR_CHECK_ALLOC(filter);

filter->f.apply = apply;

filter->f.do_free = NULL;

memcpy(&filter->attrs, &ca, sizeof(struct crlf_attrs));

return git_vector_insert(filters, filter);

}

int git_filter_add__crlf_to_odb(git_vector *filters, git_repository *repo, const char *path)

{

return find_and_add_filter(filters, repo, path, &crlf_apply_to_odb);

}

int git_filter_add__crlf_to_workdir(git_vector *filters, git_repository *repo, const char *path)

{

return find_and_add_filter(filters, repo, path, &crlf_apply_to_workdir);

}