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#include "cache.h"
#include "attr.h"
#include "run-command.h"
#include "quote.h"
#include "sigchain.h"
/*
* convert.c - convert a file when checking it out and checking it in.
*
* This should use the pathname to decide on whether it wants to do some
* more interesting conversions (automatic gzip/unzip, general format
* conversions etc etc), but by default it just does automatic CRLF<->LF
* translation when the "text" attribute or "auto_crlf" option is set.
*/
enum crlf_action {
CRLF_GUESS = -1,
CRLF_BINARY = 0,
CRLF_TEXT,
CRLF_INPUT,
CRLF_CRLF,
CRLF_AUTO
};
struct text_stat {
/* NUL, CR, LF and CRLF counts */
unsigned nul, cr, lf, crlf;
/* These are just approximations! */
unsigned printable, nonprintable;
};
static void gather_stats(const char *buf, unsigned long size, struct text_stat *stats)
{
unsigned long i;
memset(stats, 0, sizeof(*stats));
for (i = 0; i < size; i++) {
unsigned char c = buf[i];
if (c == '\r') {
stats->cr++;
if (i+1 < size && buf[i+1] == '\n')
stats->crlf++;
continue;
}
if (c == '\n') {
stats->lf++;
continue;
}
if (c == 127)
/* DEL */
stats->nonprintable++;
else if (c < 32) {
switch (c) {
/* BS, HT, ESC and FF */
case '\b': case '\t': case '\033': case '\014':
stats->printable++;
break;
case 0:
stats->nul++;
/* fall through */
default:
stats->nonprintable++;
}
}
else
stats->printable++;
}
/* If file ends with EOF then don't count this EOF as non-printable. */
if (size >= 1 && buf[size-1] == '\032')
stats->nonprintable--;
}
/*
* The same heuristics as diff.c::mmfile_is_binary()
*/
static int is_binary(unsigned long size, struct text_stat *stats)
{
if (stats->nul)
return 1;
if ((stats->printable >> 7) < stats->nonprintable)
return 1;
/*
* Other heuristics? Average line length might be relevant,
* as might LF vs CR vs CRLF counts..
*
* NOTE! It might be normal to have a low ratio of CRLF to LF
* (somebody starts with a LF-only file and edits it with an editor
* that adds CRLF only to lines that are added..). But do we
* want to support CR-only? Probably not.
*/
return 0;
}
static enum eol output_eol(enum crlf_action crlf_action)
{
switch (crlf_action) {
case CRLF_BINARY:
return EOL_UNSET;
case CRLF_CRLF:
return EOL_CRLF;
case CRLF_INPUT:
return EOL_LF;
case CRLF_GUESS:
if (!auto_crlf)
return EOL_UNSET;
/* fall through */
case CRLF_TEXT:
case CRLF_AUTO:
if (auto_crlf == AUTO_CRLF_TRUE)
return EOL_CRLF;
else if (auto_crlf == AUTO_CRLF_INPUT)
return EOL_LF;
else if (core_eol == EOL_UNSET)
return EOL_NATIVE;
}
return core_eol;
}
static void check_safe_crlf(const char *path, enum crlf_action crlf_action,
struct text_stat *stats, enum safe_crlf checksafe)
{
if (!checksafe)
return;
if (output_eol(crlf_action) == EOL_LF) {
/*
* CRLFs would not be restored by checkout:
* check if we'd remove CRLFs
*/
if (stats->crlf) {
if (checksafe == SAFE_CRLF_WARN)
warning("CRLF will be replaced by LF in %s.\nThe file will have its original line endings in your working directory.", path);
else /* i.e. SAFE_CRLF_FAIL */
die("CRLF would be replaced by LF in %s.", path);
}
} else if (output_eol(crlf_action) == EOL_CRLF) {
/*
* CRLFs would be added by checkout:
* check if we have "naked" LFs
*/
if (stats->lf != stats->crlf) {
if (checksafe == SAFE_CRLF_WARN)
warning("LF will be replaced by CRLF in %s.\nThe file will have its original line endings in your working directory.", path);
else /* i.e. SAFE_CRLF_FAIL */
die("LF would be replaced by CRLF in %s", path);
}
}
}
static int has_cr_in_index(const char *path)
{
unsigned long sz;
void *data;
int has_cr;
data = read_blob_data_from_cache(path, &sz);
if (!data)
return 0;
has_cr = memchr(data, '\r', sz) != NULL;
free(data);
return has_cr;
}
static int crlf_to_git(const char *path, const char *src, size_t len,
struct strbuf *buf,
enum crlf_action crlf_action, enum safe_crlf checksafe)
{
struct text_stat stats;
char *dst;
if (crlf_action == CRLF_BINARY ||
(crlf_action == CRLF_GUESS && auto_crlf == AUTO_CRLF_FALSE) ||
(src && !len))
return 0;
/*
* If we are doing a dry-run and have no source buffer, there is
* nothing to analyze; we must assume we would convert.
*/
if (!buf && !src)
return 1;
gather_stats(src, len, &stats);
if (crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS) {
/*
* 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 0;
/*
* And add some heuristics for binary vs text, of course...
*/
if (is_binary(len, &stats))
return 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;
}
}
check_safe_crlf(path, crlf_action, &stats, checksafe);
/* Optimization: No CR? Nothing to convert, regardless. */
if (!stats.cr)
return 0;
/*
* At this point all of our source analysis is done, and we are sure we
* would convert. If we are in dry-run mode, we can give an answer.
*/
if (!buf)
return 1;
/* only grow if not in place */
if (strbuf_avail(buf) + buf->len < len)
strbuf_grow(buf, len - buf->len);
dst = buf->buf;
if (crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS) {
/*
* If we guessed, we already know we rejected a file with
* lone CR, and we can strip a CR without looking at what
* follow it.
*/
do {
unsigned char c = *src++;
if (c != '\r')
*dst++ = c;
} while (--len);
} else {
do {
unsigned char c = *src++;
if (! (c == '\r' && (1 < len && *src == '\n')))
*dst++ = c;
} while (--len);
}
strbuf_setlen(buf, dst - buf->buf);
return 1;
}
static int crlf_to_worktree(const char *path, const char *src, size_t len,
struct strbuf *buf, enum crlf_action crlf_action)
{
char *to_free = NULL;
struct text_stat stats;
if (!len || output_eol(crlf_action) != EOL_CRLF)
return 0;
gather_stats(src, len, &stats);
/* No LF? Nothing to convert, regardless. */
if (!stats.lf)
return 0;
/* Was it already in CRLF format? */
if (stats.lf == stats.crlf)
return 0;
if (crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS) {
if (crlf_action == CRLF_GUESS) {
/* If we have any CR or CRLF line endings, we do not touch it */
/* This is the new safer autocrlf-handling */
if (stats.cr > 0 || stats.crlf > 0)
return 0;
}
/* If we have any bare CR characters, we're not going to touch it */
if (stats.cr != stats.crlf)
return 0;
if (is_binary(len, &stats))
return 0;
}
/* are we "faking" in place editing ? */
if (src == buf->buf)
to_free = strbuf_detach(buf, NULL);
strbuf_grow(buf, len + stats.lf - stats.crlf);
for (;;) {
const char *nl = memchr(src, '\n', len);
if (!nl)
break;
if (nl > src && nl[-1] == '\r') {
strbuf_add(buf, src, nl + 1 - src);
} else {
strbuf_add(buf, src, nl - src);
strbuf_addstr(buf, "\r\n");
}
len -= nl + 1 - src;
src = nl + 1;
}
strbuf_add(buf, src, len);
free(to_free);
return 1;
}
struct filter_params {
const char *src;
unsigned long size;
int fd;
const char *cmd;
const char *path;
};
static int filter_buffer_or_fd(int in, int out, void *data)
{
/*
* Spawn cmd and feed the buffer contents through its stdin.
*/
struct child_process child_process = CHILD_PROCESS_INIT;
struct filter_params *params = (struct filter_params *)data;
int write_err, status;
const char *argv[] = { NULL, NULL };
/* apply % substitution to cmd */
struct strbuf cmd = STRBUF_INIT;
struct strbuf path = STRBUF_INIT;
struct strbuf_expand_dict_entry dict[] = {
{ "f", NULL, },
{ NULL, NULL, },
};
/* quote the path to preserve spaces, etc. */
sq_quote_buf(&path, params->path);
dict[0].value = path.buf;
/* expand all %f with the quoted path */
strbuf_expand(&cmd, params->cmd, strbuf_expand_dict_cb, &dict);
strbuf_release(&path);
argv[0] = cmd.buf;
child_process.argv = argv;
child_process.use_shell = 1;
child_process.in = -1;
child_process.out = out;
if (start_command(&child_process))
return error("cannot fork to run external filter %s", params->cmd);
sigchain_push(SIGPIPE, SIG_IGN);
if (params->src) {
write_err = (write_in_full(child_process.in,
params->src, params->size) < 0);
if (errno == EPIPE)
write_err = 0;
} else {
write_err = copy_fd(params->fd, child_process.in);
if (write_err == COPY_WRITE_ERROR && errno == EPIPE)
write_err = 0;
}
if (close(child_process.in))
write_err = 1;
if (write_err)
error("cannot feed the input to external filter %s", params->cmd);
sigchain_pop(SIGPIPE);
status = finish_command(&child_process);
if (status)
error("external filter %s failed %d", params->cmd, status);
strbuf_release(&cmd);
return (write_err || status);
}
static int apply_filter(const char *path, const char *src, size_t len, int fd,
struct strbuf *dst, const char *cmd)
{
/*
* Create a pipeline to have the command filter the buffer's
* contents.
*
* (child --> cmd) --> us
*/
int ret = 1;
struct strbuf nbuf = STRBUF_INIT;
struct async async;
struct filter_params params;
if (!cmd)
return 0;
if (!dst)
return 1;
memset(&async, 0, sizeof(async));
async.proc = filter_buffer_or_fd;
async.data = &params;
async.out = -1;
params.src = src;
params.size = len;
params.fd = fd;
params.cmd = cmd;
params.path = path;
fflush(NULL);
if (start_async(&async))
return 0; /* error was already reported */
if (strbuf_read(&nbuf, async.out, len) < 0) {
error("read from external filter %s failed", cmd);
ret = 0;
}
if (close(async.out)) {
error("read from external filter %s failed", cmd);
ret = 0;
}
if (finish_async(&async)) {
error("external filter %s failed", cmd);
ret = 0;
}
if (ret) {
strbuf_swap(dst, &nbuf);
}
strbuf_release(&nbuf);
return ret;
}
static struct convert_driver {
const char *name;
struct convert_driver *next;
const char *smudge;
const char *clean;
int required;
} *user_convert, **user_convert_tail;
static int read_convert_config(const char *var, const char *value, void *cb)
{
const char *key, *name;
int namelen;
struct convert_driver *drv;
/*
* External conversion drivers are configured using
* "filter.<name>.variable".
*/
if (parse_config_key(var, "filter", &name, &namelen, &key) < 0 || !name)
return 0;
for (drv = user_convert; drv; drv = drv->next)
if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
break;
if (!drv) {
drv = xcalloc(1, sizeof(struct convert_driver));
drv->name = xmemdupz(name, namelen);
*user_convert_tail = drv;
user_convert_tail = &(drv->next);
}
/*
* filter.<name>.smudge and filter.<name>.clean specifies
* the command line:
*
* command-line
*
* The command-line will not be interpolated in any way.
*/
if (!strcmp("smudge", key))
return git_config_string(&drv->smudge, var, value);
if (!strcmp("clean", key))
return git_config_string(&drv->clean, var, value);
if (!strcmp("required", key)) {
drv->required = git_config_bool(var, value);
return 0;
}
return 0;
}
static int count_ident(const char *cp, unsigned long size)
{
/*
* "$Id: 0000000000000000000000000000000000000000 $" <=> "$Id$"
*/
int cnt = 0;
char ch;
while (size) {
ch = *cp++;
size--;
if (ch != '$')
continue;
if (size < 3)
break;
if (memcmp("Id", cp, 2))
continue;
ch = cp[2];
cp += 3;
size -= 3;
if (ch == '$')
cnt++; /* $Id$ */
if (ch != ':')
continue;
/*
* "$Id: ... "; scan up to the closing dollar sign and discard.
*/
while (size) {
ch = *cp++;
size--;
if (ch == '$') {
cnt++;
break;
}
if (ch == '\n')
break;
}
}
return cnt;
}
static int ident_to_git(const char *path, const char *src, size_t len,
struct strbuf *buf, int ident)
{
char *dst, *dollar;
if (!ident || (src && !count_ident(src, len)))
return 0;
if (!buf)
return 1;
/* only grow if not in place */
if (strbuf_avail(buf) + buf->len < len)
strbuf_grow(buf, len - buf->len);
dst = buf->buf;
for (;;) {
dollar = memchr(src, '$', len);
if (!dollar)
break;
memmove(dst, src, dollar + 1 - src);
dst += dollar + 1 - src;
len -= dollar + 1 - src;
src = dollar + 1;
if (len > 3 && !memcmp(src, "Id:", 3)) {
dollar = memchr(src + 3, '$', len - 3);
if (!dollar)
break;
if (memchr(src + 3, '\n', dollar - src - 3)) {
/* Line break before the next dollar. */
continue;
}
memcpy(dst, "Id$", 3);
dst += 3;
len -= dollar + 1 - src;
src = dollar + 1;
}
}
memmove(dst, src, len);
strbuf_setlen(buf, dst + len - buf->buf);
return 1;
}
static int ident_to_worktree(const char *path, const char *src, size_t len,
struct strbuf *buf, int ident)
{
unsigned char sha1[20];
char *to_free = NULL, *dollar, *spc;
int cnt;
if (!ident)
return 0;
cnt = count_ident(src, len);
if (!cnt)
return 0;
/* are we "faking" in place editing ? */
if (src == buf->buf)
to_free = strbuf_detach(buf, NULL);
hash_sha1_file(src, len, "blob", sha1);
strbuf_grow(buf, len + cnt * 43);
for (;;) {
/* step 1: run to the next '$' */
dollar = memchr(src, '$', len);
if (!dollar)
break;
strbuf_add(buf, src, dollar + 1 - src);
len -= dollar + 1 - src;
src = dollar + 1;
/* step 2: does it looks like a bit like Id:xxx$ or Id$ ? */
if (len < 3 || memcmp("Id", src, 2))
continue;
/* step 3: skip over Id$ or Id:xxxxx$ */
if (src[2] == '$') {
src += 3;
len -= 3;
} else if (src[2] == ':') {
/*
* It's possible that an expanded Id has crept its way into the
* repository, we cope with that by stripping the expansion out.
* This is probably not a good idea, since it will cause changes
* on checkout, which won't go away by stash, but let's keep it
* for git-style ids.
*/
dollar = memchr(src + 3, '$', len - 3);
if (!dollar) {
/* incomplete keyword, no more '$', so just quit the loop */
break;
}
if (memchr(src + 3, '\n', dollar - src - 3)) {
/* Line break before the next dollar. */
continue;
}
spc = memchr(src + 4, ' ', dollar - src - 4);
if (spc && spc < dollar-1) {
/* There are spaces in unexpected places.
* This is probably an id from some other
* versioning system. Keep it for now.
*/
continue;
}
len -= dollar + 1 - src;
src = dollar + 1;
} else {
/* it wasn't a "Id$" or "Id:xxxx$" */
continue;
}
/* step 4: substitute */
strbuf_addstr(buf, "Id: ");
strbuf_add(buf, sha1_to_hex(sha1), 40);
strbuf_addstr(buf, " $");
}
strbuf_add(buf, src, len);
free(to_free);
return 1;
}
static enum crlf_action git_path_check_crlf(const char *path, struct git_attr_check *check)
{
const char *value = check->value;
if (ATTR_TRUE(value))
return CRLF_TEXT;
else if (ATTR_FALSE(value))
return CRLF_BINARY;
else if (ATTR_UNSET(value))
;
else if (!strcmp(value, "input"))
return CRLF_INPUT;
else if (!strcmp(value, "auto"))
return CRLF_AUTO;
return CRLF_GUESS;
}
static enum eol git_path_check_eol(const char *path, struct git_attr_check *check)
{
const char *value = check->value;
if (ATTR_UNSET(value))
;
else if (!strcmp(value, "lf"))
return EOL_LF;
else if (!strcmp(value, "crlf"))
return EOL_CRLF;
return EOL_UNSET;
}
static struct convert_driver *git_path_check_convert(const char *path,
struct git_attr_check *check)
{
const char *value = check->value;
struct convert_driver *drv;
if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
return NULL;
for (drv = user_convert; drv; drv = drv->next)
if (!strcmp(value, drv->name))
return drv;
return NULL;
}
static int git_path_check_ident(const char *path, struct git_attr_check *check)
{
const char *value = check->value;
return !!ATTR_TRUE(value);
}
static enum crlf_action input_crlf_action(enum crlf_action text_attr, enum eol eol_attr)
{
if (text_attr == CRLF_BINARY)
return CRLF_BINARY;
if (eol_attr == EOL_LF)
return CRLF_INPUT;
if (eol_attr == EOL_CRLF)
return CRLF_CRLF;
return text_attr;
}
struct conv_attrs {
struct convert_driver *drv;
enum crlf_action crlf_action;
enum eol eol_attr;
int ident;
};
static const char *conv_attr_name[] = {
"crlf", "ident", "filter", "eol", "text",
};
#define NUM_CONV_ATTRS ARRAY_SIZE(conv_attr_name)
static void convert_attrs(struct conv_attrs *ca, const char *path)
{
int i;
static struct git_attr_check ccheck[NUM_CONV_ATTRS];
if (!ccheck[0].attr) {
for (i = 0; i < NUM_CONV_ATTRS; i++)
ccheck[i].attr = git_attr(conv_attr_name[i]);
user_convert_tail = &user_convert;
git_config(read_convert_config, NULL);
}
if (!git_check_attr(path, NUM_CONV_ATTRS, ccheck)) {
ca->crlf_action = git_path_check_crlf(path, ccheck + 4);
if (ca->crlf_action == CRLF_GUESS)
ca->crlf_action = git_path_check_crlf(path, ccheck + 0);
ca->ident = git_path_check_ident(path, ccheck + 1);
ca->drv = git_path_check_convert(path, ccheck + 2);
ca->eol_attr = git_path_check_eol(path, ccheck + 3);
} else {
ca->drv = NULL;
ca->crlf_action = CRLF_GUESS;
ca->eol_attr = EOL_UNSET;
ca->ident = 0;
}
}
int would_convert_to_git_filter_fd(const char *path)
{
struct conv_attrs ca;
convert_attrs(&ca, path);
if (!ca.drv)
return 0;
/*
* Apply a filter to an fd only if the filter is required to succeed.
* We must die if the filter fails, because the original data before
* filtering is not available.
*/
if (!ca.drv->required)
return 0;
return apply_filter(path, NULL, 0, -1, NULL, ca.drv->clean);
}
int convert_to_git(const char *path, const char *src, size_t len,
struct strbuf *dst, enum safe_crlf checksafe)
{
int ret = 0;
const char *filter = NULL;
int required = 0;
struct conv_attrs ca;
convert_attrs(&ca, path);
if (ca.drv) {
filter = ca.drv->clean;
required = ca.drv->required;
}
ret |= apply_filter(path, src, len, -1, dst, filter);
if (!ret && required)
die("%s: clean filter '%s' failed", path, ca.drv->name);
if (ret && dst) {
src = dst->buf;
len = dst->len;
}
ca.crlf_action = input_crlf_action(ca.crlf_action, ca.eol_attr);
ret |= crlf_to_git(path, src, len, dst, ca.crlf_action, checksafe);
if (ret && dst) {
src = dst->buf;
len = dst->len;
}
return ret | ident_to_git(path, src, len, dst, ca.ident);
}
void convert_to_git_filter_fd(const char *path, int fd, struct strbuf *dst,
enum safe_crlf checksafe)
{
struct conv_attrs ca;
convert_attrs(&ca, path);
assert(ca.drv);
assert(ca.drv->clean);
if (!apply_filter(path, NULL, 0, fd, dst, ca.drv->clean))
die("%s: clean filter '%s' failed", path, ca.drv->name);
ca.crlf_action = input_crlf_action(ca.crlf_action, ca.eol_attr);
crlf_to_git(path, dst->buf, dst->len, dst, ca.crlf_action, checksafe);
ident_to_git(path, dst->buf, dst->len, dst, ca.ident);
}
static int convert_to_working_tree_internal(const char *path, const char *src,
size_t len, struct strbuf *dst,
int normalizing)
{
int ret = 0, ret_filter = 0;
const char *filter = NULL;
int required = 0;
struct conv_attrs ca;
convert_attrs(&ca, path);
if (ca.drv) {
filter = ca.drv->smudge;
required = ca.drv->required;
}
ret |= ident_to_worktree(path, src, len, dst, ca.ident);
if (ret) {
src = dst->buf;
len = dst->len;
}
/*
* CRLF conversion can be skipped if normalizing, unless there
* is a smudge filter. The filter might expect CRLFs.
*/
if (filter || !normalizing) {
ca.crlf_action = input_crlf_action(ca.crlf_action, ca.eol_attr);
ret |= crlf_to_worktree(path, src, len, dst, ca.crlf_action);
if (ret) {
src = dst->buf;
len = dst->len;
}
}
ret_filter = apply_filter(path, src, len, -1, dst, filter);
if (!ret_filter && required)
die("%s: smudge filter %s failed", path, ca.drv->name);
return ret | ret_filter;
}
int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst)
{
return convert_to_working_tree_internal(path, src, len, dst, 0);
}
int renormalize_buffer(const char *path, const char *src, size_t len, struct strbuf *dst)
{
int ret = convert_to_working_tree_internal(path, src, len, dst, 1);
if (ret) {
src = dst->buf;
len = dst->len;
}
return ret | convert_to_git(path, src, len, dst, SAFE_CRLF_FALSE);
}
/*****************************************************************
*
* Streaming conversion support
*
*****************************************************************/
typedef int (*filter_fn)(struct stream_filter *,
const char *input, size_t *isize_p,
char *output, size_t *osize_p);
typedef void (*free_fn)(struct stream_filter *);
struct stream_filter_vtbl {
filter_fn filter;
free_fn free;
};
struct stream_filter {
struct stream_filter_vtbl *vtbl;
};
static int null_filter_fn(struct stream_filter *filter,
const char *input, size_t *isize_p,
char *output, size_t *osize_p)
{
size_t count;
if (!input)
return 0; /* we do not keep any states */
count = *isize_p;
if (*osize_p < count)
count = *osize_p;
if (count) {
memmove(output, input, count);
*isize_p -= count;
*osize_p -= count;
}
return 0;
}
static void null_free_fn(struct stream_filter *filter)
{
; /* nothing -- null instances are shared */
}
static struct stream_filter_vtbl null_vtbl = {
null_filter_fn,
null_free_fn,
};
static struct stream_filter null_filter_singleton = {
&null_vtbl,
};
int is_null_stream_filter(struct stream_filter *filter)
{
return filter == &null_filter_singleton;
}
/*
* LF-to-CRLF filter
*/
struct lf_to_crlf_filter {
struct stream_filter filter;
unsigned has_held:1;
char held;
};
static int lf_to_crlf_filter_fn(struct stream_filter *filter,
const char *input, size_t *isize_p,
char *output, size_t *osize_p)
{
size_t count, o = 0;
struct lf_to_crlf_filter *lf_to_crlf = (struct lf_to_crlf_filter *)filter;
/*
* We may be holding onto the CR to see if it is followed by a
* LF, in which case we would need to go to the main loop.
* Otherwise, just emit it to the output stream.
*/
if (lf_to_crlf->has_held && (lf_to_crlf->held != '\r' || !input)) {
output[o++] = lf_to_crlf->held;
lf_to_crlf->has_held = 0;
}
/* We are told to drain */
if (!input) {
*osize_p -= o;
return 0;
}
count = *isize_p;
if (count || lf_to_crlf->has_held) {
size_t i;
int was_cr = 0;
if (lf_to_crlf->has_held) {
was_cr = 1;
lf_to_crlf->has_held = 0;
}
for (i = 0; o < *osize_p && i < count; i++) {
char ch = input[i];
if (ch == '\n') {
output[o++] = '\r';
} else if (was_cr) {
/*
* Previous round saw CR and it is not followed
* by a LF; emit the CR before processing the
* current character.
*/
output[o++] = '\r';
}
/*
* We may have consumed the last output slot,
* in which case we need to break out of this
* loop; hold the current character before
* returning.
*/
if (*osize_p <= o) {
lf_to_crlf->has_held = 1;
lf_to_crlf->held = ch;
continue; /* break but increment i */
}
if (ch == '\r') {
was_cr = 1;
continue;
}
was_cr = 0;
output[o++] = ch;
}
*osize_p -= o;
*isize_p -= i;
if (!lf_to_crlf->has_held && was_cr) {
lf_to_crlf->has_held = 1;
lf_to_crlf->held = '\r';
}
}
return 0;
}
static void lf_to_crlf_free_fn(struct stream_filter *filter)
{
free(filter);
}
static struct stream_filter_vtbl lf_to_crlf_vtbl = {
lf_to_crlf_filter_fn,
lf_to_crlf_free_fn,
};
static struct stream_filter *lf_to_crlf_filter(void)
{
struct lf_to_crlf_filter *lf_to_crlf = xcalloc(1, sizeof(*lf_to_crlf));
lf_to_crlf->filter.vtbl = &lf_to_crlf_vtbl;
return (struct stream_filter *)lf_to_crlf;
}
/*
* Cascade filter
*/
#define FILTER_BUFFER 1024
struct cascade_filter {
struct stream_filter filter;
struct stream_filter *one;
struct stream_filter *two;
char buf[FILTER_BUFFER];
int end, ptr;
};
static int cascade_filter_fn(struct stream_filter *filter,
const char *input, size_t *isize_p,
char *output, size_t *osize_p)
{
struct cascade_filter *cas = (struct cascade_filter *) filter;
size_t filled = 0;
size_t sz = *osize_p;
size_t to_feed, remaining;
/*
* input -- (one) --> buf -- (two) --> output
*/
while (filled < sz) {
remaining = sz - filled;
/* do we already have something to feed two with? */
if (cas->ptr < cas->end) {
to_feed = cas->end - cas->ptr;
if (stream_filter(cas->two,
cas->buf + cas->ptr, &to_feed,
output + filled, &remaining))
return -1;
cas->ptr += (cas->end - cas->ptr) - to_feed;
filled = sz - remaining;
continue;
}
/* feed one from upstream and have it emit into our buffer */
to_feed = input ? *isize_p : 0;
if (input && !to_feed)
break;
remaining = sizeof(cas->buf);
if (stream_filter(cas->one,
input, &to_feed,
cas->buf, &remaining))
return -1;
cas->end = sizeof(cas->buf) - remaining;
cas->ptr = 0;
if (input) {
size_t fed = *isize_p - to_feed;
*isize_p -= fed;
input += fed;
}
/* do we know that we drained one completely? */
if (input || cas->end)
continue;
/* tell two to drain; we have nothing more to give it */
to_feed = 0;
remaining = sz - filled;
if (stream_filter(cas->two,
NULL, &to_feed,
output + filled, &remaining))
return -1;
if (remaining == (sz - filled))
break; /* completely drained two */
filled = sz - remaining;
}
*osize_p -= filled;
return 0;
}
static void cascade_free_fn(struct stream_filter *filter)
{
struct cascade_filter *cas = (struct cascade_filter *)filter;
free_stream_filter(cas->one);
free_stream_filter(cas->two);
free(filter);
}
static struct stream_filter_vtbl cascade_vtbl = {
cascade_filter_fn,
cascade_free_fn,
};
static struct stream_filter *cascade_filter(struct stream_filter *one,
struct stream_filter *two)
{
struct cascade_filter *cascade;
if (!one || is_null_stream_filter(one))
return two;
if (!two || is_null_stream_filter(two))
return one;
cascade = xmalloc(sizeof(*cascade));
cascade->one = one;
cascade->two = two;
cascade->end = cascade->ptr = 0;
cascade->filter.vtbl = &cascade_vtbl;
return (struct stream_filter *)cascade;
}
/*
* ident filter
*/
#define IDENT_DRAINING (-1)
#define IDENT_SKIPPING (-2)
struct ident_filter {
struct stream_filter filter;
struct strbuf left;
int state;
char ident[45]; /* ": x40 $" */
};
static int is_foreign_ident(const char *str)
{
int i;
if (!skip_prefix(str, "$Id: ", &str))
return 0;
for (i = 0; str[i]; i++) {
if (isspace(str[i]) && str[i+1] != '$')
return 1;
}
return 0;
}
static void ident_drain(struct ident_filter *ident, char **output_p, size_t *osize_p)
{
size_t to_drain = ident->left.len;
if (*osize_p < to_drain)
to_drain = *osize_p;
if (to_drain) {
memcpy(*output_p, ident->left.buf, to_drain);
strbuf_remove(&ident->left, 0, to_drain);
*output_p += to_drain;
*osize_p -= to_drain;
}
if (!ident->left.len)
ident->state = 0;
}
static int ident_filter_fn(struct stream_filter *filter,
const char *input, size_t *isize_p,
char *output, size_t *osize_p)
{
struct ident_filter *ident = (struct ident_filter *)filter;
static const char head[] = "$Id";
if (!input) {
/* drain upon eof */
switch (ident->state) {
default:
strbuf_add(&ident->left, head, ident->state);
case IDENT_SKIPPING:
/* fallthru */
case IDENT_DRAINING:
ident_drain(ident, &output, osize_p);
}
return 0;
}
while (*isize_p || (ident->state == IDENT_DRAINING)) {
int ch;
if (ident->state == IDENT_DRAINING) {
ident_drain(ident, &output, osize_p);
if (!*osize_p)
break;
continue;
}
ch = *(input++);
(*isize_p)--;
if (ident->state == IDENT_SKIPPING) {
/*
* Skipping until '$' or LF, but keeping them
* in case it is a foreign ident.
*/
strbuf_addch(&ident->left, ch);
if (ch != '\n' && ch != '$')
continue;
if (ch == '$' && !is_foreign_ident(ident->left.buf)) {
strbuf_setlen(&ident->left, sizeof(head) - 1);
strbuf_addstr(&ident->left, ident->ident);
}
ident->state = IDENT_DRAINING;
continue;
}
if (ident->state < sizeof(head) &&
head[ident->state] == ch) {
ident->state++;
continue;
}
if (ident->state)
strbuf_add(&ident->left, head, ident->state);
if (ident->state == sizeof(head) - 1) {
if (ch != ':' && ch != '$') {
strbuf_addch(&ident->left, ch);
ident->state = 0;
continue;
}
if (ch == ':') {
strbuf_addch(&ident->left, ch);
ident->state = IDENT_SKIPPING;
} else {
strbuf_addstr(&ident->left, ident->ident);
ident->state = IDENT_DRAINING;
}
continue;
}
strbuf_addch(&ident->left, ch);
ident->state = IDENT_DRAINING;
}
return 0;
}
static void ident_free_fn(struct stream_filter *filter)
{
struct ident_filter *ident = (struct ident_filter *)filter;
strbuf_release(&ident->left);
free(filter);
}
static struct stream_filter_vtbl ident_vtbl = {
ident_filter_fn,
ident_free_fn,
};
static struct stream_filter *ident_filter(const unsigned char *sha1)
{
struct ident_filter *ident = xmalloc(sizeof(*ident));
sprintf(ident->ident, ": %s $", sha1_to_hex(sha1));
strbuf_init(&ident->left, 0);
ident->filter.vtbl = &ident_vtbl;
ident->state = 0;
return (struct stream_filter *)ident;
}
/*
* Return an appropriately constructed filter for the path, or NULL if
* the contents cannot be filtered without reading the whole thing
* in-core.
*
* Note that you would be crazy to set CRLF, smuge/clean or ident to a
* large binary blob you would want us not to slurp into the memory!
*/
struct stream_filter *get_stream_filter(const char *path, const unsigned char *sha1)
{
struct conv_attrs ca;
enum crlf_action crlf_action;
struct stream_filter *filter = NULL;
convert_attrs(&ca, path);
if (ca.drv && (ca.drv->smudge || ca.drv->clean))
return filter;
if (ca.ident)
filter = ident_filter(sha1);
crlf_action = input_crlf_action(ca.crlf_action, ca.eol_attr);
if ((crlf_action == CRLF_BINARY) || (crlf_action == CRLF_INPUT) ||
(crlf_action == CRLF_GUESS && auto_crlf == AUTO_CRLF_FALSE))
filter = cascade_filter(filter, &null_filter_singleton);
else if (output_eol(crlf_action) == EOL_CRLF &&
!(crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS))
filter = cascade_filter(filter, lf_to_crlf_filter());
return filter;
}
void free_stream_filter(struct stream_filter *filter)
{
filter->vtbl->free(filter);
}
int stream_filter(struct stream_filter *filter,
const char *input, size_t *isize_p,
char *output, size_t *osize_p)
{
return filter->vtbl->filter(filter, input, isize_p, output, osize_p);
}
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