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Annotation of src/usr.bin/tmux/regsub.c, Revision 1.1

1.1     ! nicm        1: /* $OpenBSD$ */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 2019 Nicholas Marriott <nicholas.marriott@gmail.com>
        !             5:  *
        !             6:  * Permission to use, copy, modify, and distribute this software for any
        !             7:  * purpose with or without fee is hereby granted, provided that the above
        !             8:  * copyright notice and this permission notice appear in all copies.
        !             9:  *
        !            10:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
        !            11:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
        !            12:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
        !            13:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
        !            14:  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
        !            15:  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
        !            16:  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            17:  */
        !            18:
        !            19: #include <sys/types.h>
        !            20:
        !            21: #include <regex.h>
        !            22: #include <string.h>
        !            23:
        !            24: #include "tmux.h"
        !            25:
        !            26: static void
        !            27: regsub_copy(char **buf, size_t *len, const char *text, size_t start,
        !            28:     size_t end)
        !            29: {
        !            30:        size_t  add = end - start;
        !            31:
        !            32:        *buf = xrealloc(*buf, (*len) + add + 1);
        !            33:        memcpy((*buf) + *len, text + start, add);
        !            34:        (*len) += add;
        !            35: }
        !            36:
        !            37: static void
        !            38: regsub_expand(char **buf, size_t *len, const char *with, const char *text,
        !            39:     regmatch_t *m, u_int n)
        !            40: {
        !            41:        const char      *cp;
        !            42:        u_int            i;
        !            43:
        !            44:        for (cp = with; *cp != '\0'; cp++) {
        !            45:                if (*cp == '\\') {
        !            46:                        cp++;
        !            47:                        if (*cp >= '0' && *cp <= '9') {
        !            48:                                i = *cp - '0';
        !            49:                                if (i < n && m[i].rm_so != m[i].rm_eo) {
        !            50:                                        regsub_copy(buf, len, text, m[i].rm_so,
        !            51:                                            m[i].rm_eo);
        !            52:                                        continue;
        !            53:                                }
        !            54:                        }
        !            55:                }
        !            56:                *buf = xrealloc(*buf, (*len) + 2);
        !            57:                (*buf)[(*len)++] = *cp;
        !            58:        }
        !            59: }
        !            60:
        !            61: char *
        !            62: regsub(const char *pattern, const char *with, const char *text, int flags)
        !            63: {
        !            64:        regex_t          r;
        !            65:        regmatch_t       m[10];
        !            66:        size_t           start, end, len = 0;
        !            67:        char            *buf = NULL;
        !            68:
        !            69:        if (*text == '\0')
        !            70:                return (xstrdup(""));
        !            71:        if (regcomp(&r, pattern, flags) != 0)
        !            72:                return (NULL);
        !            73:
        !            74:        start = 0;
        !            75:        end = strlen(text);
        !            76:
        !            77:        while (start != end) {
        !            78:                m[0].rm_so = start;
        !            79:                m[0].rm_eo = end;
        !            80:
        !            81:                if (regexec(&r, text, nitems(m), m, REG_STARTEND) != 0) {
        !            82:                        regsub_copy(&buf, &len, text, start, end);
        !            83:                        break;
        !            84:                }
        !            85:                if (m[0].rm_so == m[0].rm_eo) {
        !            86:                        regsub_copy(&buf, &len, text, start, end);
        !            87:                        break;
        !            88:                }
        !            89:
        !            90:                regsub_copy(&buf, &len, text, start, m[0].rm_so);
        !            91:                regsub_expand(&buf, &len, with, text, m, nitems(m));
        !            92:                start = m[0].rm_eo;
        !            93:        }
        !            94:        buf[len] = '\0';
        !            95:
        !            96:        regfree(&r);
        !            97:        return (buf);
        !            98: }