#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; const char *cmd; const char *path; }; static int filter_buffer(int in, int out, void *data) { /* * Spawn cmd and feed the buffer contents through its stdin. */ struct child_process child_process; 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; memset(&child_process, 0, sizeof(child_process)); 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); write_err = (write_in_full(child_process.in, params->src, params->size) < 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, 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; async.data = ¶ms; async.out = -1; params.src = src; params.size = len; 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 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, 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); } 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, 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 $" */ }; static int is_foreign_ident(const char *str) { int i; if (prefixcmp(str, "$Id: ")) return 0; for (i = 5; 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); }