diff options
Diffstat (limited to 'src/util/regexp.c')
| -rw-r--r-- | src/util/regexp.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/src/util/regexp.c b/src/util/regexp.c new file mode 100644 index 0000000..0870088 --- /dev/null +++ b/src/util/regexp.c @@ -0,0 +1,221 @@ +/* + * 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 "regexp.h" + +#if defined(GIT_REGEX_BUILTIN) || defined(GIT_REGEX_PCRE) + +int git_regexp_compile(git_regexp *r, const char *pattern, int flags) +{ + int erroffset, cflags = 0; + const char *error = NULL; + + if (flags & GIT_REGEXP_ICASE) + cflags |= PCRE_CASELESS; + + if ((*r = pcre_compile(pattern, cflags, &error, &erroffset, NULL)) == NULL) { + git_error_set_str(GIT_ERROR_REGEX, error); + return GIT_EINVALIDSPEC; + } + + return 0; +} + +void git_regexp_dispose(git_regexp *r) +{ + pcre_free(*r); + *r = NULL; +} + +int git_regexp_match(const git_regexp *r, const char *string) +{ + int error; + if ((error = pcre_exec(*r, NULL, string, (int) strlen(string), 0, 0, NULL, 0)) < 0) + return (error == PCRE_ERROR_NOMATCH) ? GIT_ENOTFOUND : GIT_EINVALIDSPEC; + return 0; +} + +int git_regexp_search(const git_regexp *r, const char *string, size_t nmatches, git_regmatch *matches) +{ + int static_ovec[9] = {0}, *ovec; + int error; + size_t i; + + /* The ovec array always needs to be a multiple of three */ + if (nmatches <= ARRAY_SIZE(static_ovec) / 3) + ovec = static_ovec; + else + ovec = git__calloc(nmatches * 3, sizeof(*ovec)); + GIT_ERROR_CHECK_ALLOC(ovec); + + if ((error = pcre_exec(*r, NULL, string, (int) strlen(string), 0, 0, ovec, (int) nmatches * 3)) < 0) + goto out; + + if (error == 0) + error = (int) nmatches; + + for (i = 0; i < (unsigned int) error; i++) { + matches[i].start = (ovec[i * 2] < 0) ? -1 : ovec[i * 2]; + matches[i].end = (ovec[i * 2 + 1] < 0) ? -1 : ovec[i * 2 + 1]; + } + for (i = (unsigned int) error; i < nmatches; i++) + matches[i].start = matches[i].end = -1; + +out: + if (nmatches > ARRAY_SIZE(static_ovec) / 3) + git__free(ovec); + if (error < 0) + return (error == PCRE_ERROR_NOMATCH) ? GIT_ENOTFOUND : GIT_EINVALIDSPEC; + return 0; +} + +#elif defined(GIT_REGEX_PCRE2) + +int git_regexp_compile(git_regexp *r, const char *pattern, int flags) +{ + unsigned char errmsg[1024]; + PCRE2_SIZE erroff; + int error, cflags = 0; + + if (flags & GIT_REGEXP_ICASE) + cflags |= PCRE2_CASELESS; + + if ((*r = pcre2_compile((const unsigned char *) pattern, PCRE2_ZERO_TERMINATED, + cflags, &error, &erroff, NULL)) == NULL) { + pcre2_get_error_message(error, errmsg, sizeof(errmsg)); + git_error_set_str(GIT_ERROR_REGEX, (char *) errmsg); + return GIT_EINVALIDSPEC; + } + + return 0; +} + +void git_regexp_dispose(git_regexp *r) +{ + pcre2_code_free(*r); + *r = NULL; +} + +int git_regexp_match(const git_regexp *r, const char *string) +{ + pcre2_match_data *data; + int error; + + data = pcre2_match_data_create(1, NULL); + GIT_ERROR_CHECK_ALLOC(data); + + error = pcre2_match(*r, (const unsigned char *) string, strlen(string), 0, 0, data, NULL); + pcre2_match_data_free(data); + if (error < 0) + return (error == PCRE2_ERROR_NOMATCH) ? GIT_ENOTFOUND : GIT_EINVALIDSPEC; + + return 0; +} + +int git_regexp_search(const git_regexp *r, const char *string, size_t nmatches, git_regmatch *matches) +{ + pcre2_match_data *data = NULL; + PCRE2_SIZE *ovec; + int error; + size_t i; + + if ((data = pcre2_match_data_create(nmatches, NULL)) == NULL) { + git_error_set_oom(); + goto out; + } + + if ((error = pcre2_match(*r, (const unsigned char *) string, strlen(string), + 0, 0, data, NULL)) < 0) + goto out; + + if (error == 0 || (unsigned int) error > nmatches) + error = nmatches; + ovec = pcre2_get_ovector_pointer(data); + + for (i = 0; i < (unsigned int) error; i++) { + matches[i].start = (ovec[i * 2] == PCRE2_UNSET) ? -1 : (ssize_t) ovec[i * 2]; + matches[i].end = (ovec[i * 2 + 1] == PCRE2_UNSET) ? -1 : (ssize_t) ovec[i * 2 + 1]; + } + for (i = (unsigned int) error; i < nmatches; i++) + matches[i].start = matches[i].end = -1; + +out: + pcre2_match_data_free(data); + if (error < 0) + return (error == PCRE2_ERROR_NOMATCH) ? GIT_ENOTFOUND : GIT_EINVALIDSPEC; + return 0; +} + +#elif defined(GIT_REGEX_REGCOMP) || defined(GIT_REGEX_REGCOMP_L) + +#if defined(GIT_REGEX_REGCOMP_L) +# include <xlocale.h> +#endif + +int git_regexp_compile(git_regexp *r, const char *pattern, int flags) +{ + int cflags = REG_EXTENDED, error; + char errmsg[1024]; + + if (flags & GIT_REGEXP_ICASE) + cflags |= REG_ICASE; + +# if defined(GIT_REGEX_REGCOMP) + if ((error = regcomp(r, pattern, cflags)) != 0) +# else + if ((error = regcomp_l(r, pattern, cflags, (locale_t) 0)) != 0) +# endif + { + regerror(error, r, errmsg, sizeof(errmsg)); + git_error_set_str(GIT_ERROR_REGEX, errmsg); + return GIT_EINVALIDSPEC; + } + + return 0; +} + +void git_regexp_dispose(git_regexp *r) +{ + regfree(r); +} + +int git_regexp_match(const git_regexp *r, const char *string) +{ + int error; + if ((error = regexec(r, string, 0, NULL, 0)) != 0) + return (error == REG_NOMATCH) ? GIT_ENOTFOUND : GIT_EINVALIDSPEC; + return 0; +} + +int git_regexp_search(const git_regexp *r, const char *string, size_t nmatches, git_regmatch *matches) +{ + regmatch_t static_m[3], *m; + int error; + size_t i; + + if (nmatches <= ARRAY_SIZE(static_m)) + m = static_m; + else + m = git__calloc(nmatches, sizeof(*m)); + + if ((error = regexec(r, string, nmatches, m, 0)) != 0) + goto out; + + for (i = 0; i < nmatches; i++) { + matches[i].start = (m[i].rm_so < 0) ? -1 : m[i].rm_so; + matches[i].end = (m[i].rm_eo < 0) ? -1 : m[i].rm_eo; + } + +out: + if (nmatches > ARRAY_SIZE(static_m)) + git__free(m); + if (error) + return (error == REG_NOMATCH) ? GIT_ENOTFOUND : GIT_EINVALIDSPEC; + return 0; +} + +#endif |