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

1.1     ! nicm        1: /* $OpenBSD$ */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
        !             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 "tmux.h"
        !            22:
        !            23: /* Return a section of a string around a point. */
        !            24: char *
        !            25: section_string(char *buf, size_t len, size_t sectoff, size_t sectlen)
        !            26: {
        !            27:        char    *s;
        !            28:        size_t   first, last;
        !            29:
        !            30:        if (len <= sectlen) {
        !            31:                first = 0;
        !            32:                last = len;
        !            33:        } else if (sectoff < sectlen / 2) {
        !            34:                first = 0;
        !            35:                last = sectlen;
        !            36:        } else if (sectoff + sectlen / 2 > len) {
        !            37:                last = len;
        !            38:                first = last - sectlen;
        !            39:        } else {
        !            40:                first = sectoff - sectlen / 2;
        !            41:                last = first + sectlen;
        !            42:        }
        !            43:
        !            44:        if (last - first > 3 && first != 0)
        !            45:                first += 3;
        !            46:        if (last - first > 3 && last != len)
        !            47:                last -= 3;
        !            48:
        !            49:        xasprintf(&s, "%s%.*s%s", first == 0 ? "" : "...",
        !            50:            (int) (last - first), buf + first, last == len ? "" : "...");
        !            51:        return (s);
        !            52: }
        !            53:
        !            54: /* Clean string of invisible characters. */
        !            55: void
        !            56: clean_string(const char *in, char *buf, size_t len)
        !            57: {
        !            58:        const u_char    *cp;
        !            59:        size_t           off;
        !            60:
        !            61:        off = 0;
        !            62:        for (cp = in; *cp != '\0'; cp++) {
        !            63:                if (off >= len)
        !            64:                        break;
        !            65:                if (*cp >= 0x20 && *cp <= 0x7f)
        !            66:                        buf[off++] = *cp;
        !            67:                else
        !            68:                        off += xsnprintf(buf + off, len - off, "\\%03hho", *cp);
        !            69:        }
        !            70:        if (off < len)
        !            71:                buf[off] = '\0';
        !            72: }