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Annotation of 43BSDTahoe/ucb/window/string.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #ifndef lint
        !            19: static char sccsid[] = "@(#)string.c   3.11 (Berkeley) 6/29/88";
        !            20: #endif /* not lint */
        !            21: 
        !            22: #include "string.h"
        !            23: 
        !            24: char *malloc();
        !            25: 
        !            26: char *
        !            27: str_cpy(s)
        !            28: register char *s;
        !            29: {
        !            30:        char *str;
        !            31:        register char *p;
        !            32: 
        !            33:        str = p = str_alloc(strlen(s) + 1);
        !            34:        if (p == 0)
        !            35:                return 0;
        !            36:        while (*p++ = *s++)
        !            37:                ;
        !            38:        return str;
        !            39: }
        !            40: 
        !            41: char *
        !            42: str_ncpy(s, n)
        !            43: register char *s;
        !            44: register n;
        !            45: {
        !            46:        int l = strlen(s);
        !            47:        char *str;
        !            48:        register char *p;
        !            49: 
        !            50:        if (n > l)
        !            51:                n = l;
        !            52:        str = p = str_alloc(n + 1);
        !            53:        if (p == 0)
        !            54:                return 0;
        !            55:        while (--n >= 0)
        !            56:                *p++ = *s++;
        !            57:        *p = 0;
        !            58:        return str;
        !            59: }
        !            60: 
        !            61: char *
        !            62: str_itoa(i)
        !            63: int i;
        !            64: {
        !            65:        char buf[30];
        !            66: 
        !            67:        (void) sprintf(buf, "%d", i);
        !            68:        return str_cpy(buf);
        !            69: }
        !            70: 
        !            71: char *
        !            72: str_cat(s1, s2)
        !            73: char *s1, *s2;
        !            74: {
        !            75:        char *str;
        !            76:        register char *p, *q;
        !            77: 
        !            78:        str = p = str_alloc(strlen(s1) + strlen(s2) + 1);
        !            79:        if (p == 0)
        !            80:                return 0;
        !            81:        for (q = s1; *p++ = *q++;)
        !            82:                ;
        !            83:        for (q = s2, p--; *p++ = *q++;)
        !            84:                ;
        !            85:        return str;
        !            86: }
        !            87: 
        !            88: /*
        !            89:  * match s against p.
        !            90:  * s can be a prefix of p with at least min characters.
        !            91:  */
        !            92: str_match(s, p, min)
        !            93: register char *s, *p;
        !            94: register min;
        !            95: {
        !            96:        for (; *s && *p && *s == *p; s++, p++, min--)
        !            97:                ;
        !            98:        return *s == *p || *s == 0 && min <= 0;
        !            99: }
        !           100: 
        !           101: #ifdef STR_DEBUG
        !           102: char *
        !           103: str_alloc(l)
        !           104: int l;
        !           105: {
        !           106:        register struct string *s;
        !           107: 
        !           108:        s = (struct string *) malloc((unsigned)l + str_offset);
        !           109:        if (s == 0)
        !           110:                return 0;
        !           111:        if (str_head.s_forw == 0)
        !           112:                str_head.s_forw = str_head.s_back = &str_head;
        !           113:        s->s_forw = str_head.s_forw;
        !           114:        s->s_back = &str_head;
        !           115:        str_head.s_forw = s;
        !           116:        s->s_forw->s_back = s;
        !           117:        return s->s_data;
        !           118: }
        !           119: 
        !           120: str_free(str)
        !           121: char *str;
        !           122: {
        !           123:        register struct string *s;
        !           124: 
        !           125:        for (s = str_head.s_forw; s != &str_head && s->s_data != str;
        !           126:             s = s->s_forw)
        !           127:                ;
        !           128:        if (s == &str_head)
        !           129:                abort();
        !           130:        s->s_back->s_forw = s->s_forw;
        !           131:        s->s_forw->s_back = s->s_back;
        !           132:        free((char *)s);
        !           133: }
        !           134: #endif

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