498 lines
11 KiB
C
498 lines
11 KiB
C
/*-
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* Copyright (c) 1988, 1989, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1989 by Berkeley Softworks
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Adam de Boor.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)str.c 5.8 (Berkeley) 6/1/90
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "make.h"
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static char **argv, *buffer;
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static int argmax, curlen;
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/*
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* str_init --
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* Initialize the strings package
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*
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*/
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void
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str_init()
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{
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char *p1;
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argv = (char **)emalloc(((argmax = 50) + 1) * sizeof(char *));
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argv[0] = Var_Value(".MAKE", VAR_GLOBAL, &p1);
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}
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/*
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* str_end --
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* Cleanup the strings package
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*
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*/
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void
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str_end()
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{
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if (argv) {
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if (argv[0])
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free(argv[0]);
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free(argv);
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}
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if (buffer)
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free(buffer);
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}
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/*-
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* str_concat --
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* concatenate the two strings, inserting a space or slash between them,
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* freeing them if requested.
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*
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* returns --
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* the resulting string in allocated space.
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*/
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char *
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str_concat(s1, s2, flags)
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char *s1, *s2;
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int flags;
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{
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int len1, len2;
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char *result;
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/* get the length of both strings */
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len1 = strlen(s1);
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len2 = strlen(s2);
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/* allocate length plus separator plus EOS */
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result = emalloc((u_int)(len1 + len2 + 2));
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/* copy first string into place */
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memcpy(result, s1, len1);
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/* add separator character */
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if (flags & STR_ADDSPACE) {
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result[len1] = ' ';
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++len1;
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} else if (flags & STR_ADDSLASH) {
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result[len1] = '/';
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++len1;
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}
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/* copy second string plus EOS into place */
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memcpy(result + len1, s2, len2 + 1);
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/* free original strings */
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if (flags & STR_DOFREE) {
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(void)efree(s1);
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(void)efree(s2);
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}
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return(result);
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}
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/*-
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* brk_string --
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* Fracture a string into an array of words (as delineated by tabs or
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* spaces) taking quotation marks into account. Leading tabs/spaces
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* are ignored.
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*
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* returns --
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* Pointer to the array of pointers to the words. To make life easier,
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* the first word is always the value of the .MAKE variable.
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*/
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char **
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brk_string(str, store_argc, expand)
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char *str;
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int *store_argc;
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Boolean expand;
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{
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int argc, ch;
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char inquote, *p, *start, *t;
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int len;
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/* skip leading space chars. */
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for (; *str == ' ' || *str == '\t'; ++str)
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continue;
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/* allocate room for a copy of the string */
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if ((len = strlen(str) + 1) > curlen) {
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if (buffer)
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free(buffer);
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buffer = emalloc(curlen = len);
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}
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/*
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* copy the string; at the same time, parse backslashes,
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* quotes and build the argument list.
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*/
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argc = 1;
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inquote = '\0';
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for (p = str, start = t = buffer;; ++p) {
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switch(ch = *p) {
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case '"':
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case '\'':
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if (inquote) {
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if (inquote == ch)
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inquote = '\0';
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else
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break;
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} else {
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inquote = (char) ch;
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/* Don't miss "" or '' */
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if (start == NULL && p[1] == inquote) {
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start = t + 1;
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break;
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}
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}
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if (!expand) {
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if (!start)
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start = t;
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*t++ = ch;
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}
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continue;
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case ' ':
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case '\t':
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case '\n':
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if (inquote)
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break;
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if (!start)
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continue;
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/* FALLTHROUGH */
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case '\0':
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/*
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* end of a token -- make sure there's enough argv
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* space and save off a pointer.
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*/
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if (!start)
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goto done;
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*t++ = '\0';
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if (argc == argmax) {
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argmax *= 2; /* ramp up fast */
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argv = (char **)erealloc(argv,
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(argmax + 1) * sizeof(char *));
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}
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argv[argc++] = start;
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start = (char *)NULL;
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if (ch == '\n' || ch == '\0')
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goto done;
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continue;
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case '\\':
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if (!expand) {
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if (!start)
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start = t;
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*t++ = '\\';
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ch = *++p;
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break;
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}
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switch (ch = *++p) {
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case '\0':
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case '\n':
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/* hmmm; fix it up as best we can */
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ch = '\\';
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--p;
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break;
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case 'b':
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ch = '\b';
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break;
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case 'f':
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ch = '\f';
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break;
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case 'n':
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ch = '\n';
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break;
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case 'r':
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ch = '\r';
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break;
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case 't':
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ch = '\t';
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break;
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}
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break;
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}
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if (!start)
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start = t;
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*t++ = (char) ch;
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}
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done: argv[argc] = (char *)NULL;
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*store_argc = argc;
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return(argv);
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}
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/*
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* Str_FindSubstring -- See if a string contains a particular substring.
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*
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* Results: If string contains substring, the return value is the location of
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* the first matching instance of substring in string. If string doesn't
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* contain substring, the return value is NULL. Matching is done on an exact
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* character-for-character basis with no wildcards or special characters.
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*
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* Side effects: None.
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*/
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char *
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Str_FindSubstring(string, substring)
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char *string; /* String to search. */
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char *substring; /* Substring to find in string */
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{
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char *a, *b;
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/*
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* First scan quickly through the two strings looking for a single-
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* character match. When it's found, then compare the rest of the
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* substring.
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*/
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for (b = substring; *string != 0; string += 1) {
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if (*string != *b)
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continue;
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a = string;
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for (;;) {
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if (*b == 0)
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return(string);
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if (*a++ != *b++)
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break;
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}
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b = substring;
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}
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return((char *) NULL);
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}
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/*
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* Str_Match --
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*
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* See if a particular string matches a particular pattern.
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*
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* Results: Non-zero is returned if string matches pattern, 0 otherwise. The
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* matching operation permits the following special characters in the
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* pattern: *?\[] (see the man page for details on what these mean).
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*
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* Side effects: None.
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*/
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int
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Str_Match(string, pattern)
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char *string; /* String */
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char *pattern; /* Pattern */
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{
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char c2;
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for (;;) {
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/*
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* See if we're at the end of both the pattern and the
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* string. If, we succeeded. If we're at the end of the
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* pattern but not at the end of the string, we failed.
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*/
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if (*pattern == 0)
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return(!*string);
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if (*string == 0 && *pattern != '*')
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return(0);
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/*
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* Check for a "*" as the next pattern character. It matches
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* any substring. We handle this by calling ourselves
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* recursively for each postfix of string, until either we
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* match or we reach the end of the string.
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*/
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if (*pattern == '*') {
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pattern += 1;
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if (*pattern == 0)
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return(1);
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while (*string != 0) {
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if (Str_Match(string, pattern))
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return(1);
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++string;
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}
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return(0);
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}
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/*
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* Check for a "?" as the next pattern character. It matches
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* any single character.
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*/
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if (*pattern == '?')
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goto thisCharOK;
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/*
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* Check for a "[" as the next pattern character. It is
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* followed by a list of characters that are acceptable, or
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* by a range (two characters separated by "-").
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*/
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if (*pattern == '[') {
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++pattern;
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for (;;) {
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if ((*pattern == ']') || (*pattern == 0))
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return(0);
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if (*pattern == *string)
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break;
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if (pattern[1] == '-') {
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c2 = pattern[2];
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if (c2 == 0)
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return(0);
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if ((*pattern <= *string) &&
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(c2 >= *string))
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break;
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if ((*pattern >= *string) &&
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(c2 <= *string))
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break;
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pattern += 2;
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}
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++pattern;
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}
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while ((*pattern != ']') && (*pattern != 0))
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++pattern;
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goto thisCharOK;
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}
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/*
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* If the next pattern character is '/', just strip off the
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* '/' so we do exact matching on the character that follows.
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*/
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if (*pattern == '\\') {
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++pattern;
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if (*pattern == 0)
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return(0);
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}
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/*
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* There's no special character. Just make sure that the
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* next characters of each string match.
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*/
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if (*pattern != *string)
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return(0);
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thisCharOK: ++pattern;
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++string;
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}
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}
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/*-
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*-----------------------------------------------------------------------
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* Str_SYSVMatch --
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* Check word against pattern for a match (% is wild),
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*
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* Results:
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* Returns the beginning position of a match or null. The number
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* of characters matched is returned in len.
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*
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* Side Effects:
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* None
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*
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*-----------------------------------------------------------------------
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*/
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char *
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Str_SYSVMatch(word, pattern, len)
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char *word; /* Word to examine */
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char *pattern; /* Pattern to examine against */
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int *len; /* Number of characters to substitute */
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{
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char *p = pattern;
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char *w = word;
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char *m;
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if (*w == '\0') {
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/* Zero-length word cannot be matched against */
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*len = 0;
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return NULL;
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}
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if (*p == '\0') {
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/* Null pattern is the whole string */
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*len = strlen(w);
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return w;
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}
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if ((m = strchr(p, '%')) != NULL) {
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/* check that the prefix matches */
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for (; p != m && *w && *w == *p; w++, p++)
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continue;
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if (p != m)
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return NULL; /* No match */
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if (*++p == '\0') {
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/* No more pattern, return the rest of the string */
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*len = strlen(w);
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return w;
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}
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}
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m = w;
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/* Find a matching tail */
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do
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if (strcmp(p, w) == 0) {
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*len = w - m;
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return m;
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}
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while (*w++ != '\0');
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return NULL;
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}
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/*-
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*-----------------------------------------------------------------------
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* Str_SYSVSubst --
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* Substitute '%' on the pattern with len characters from src.
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* If the pattern does not contain a '%' prepend len characters
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* from src.
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*
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* Results:
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* None
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*
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* Side Effects:
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* Places result on buf
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*
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*-----------------------------------------------------------------------
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*/
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void
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Str_SYSVSubst(buf, pat, src, len)
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Buffer buf;
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char *pat;
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char *src;
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int len;
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{
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char *m;
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if ((m = strchr(pat, '%')) != NULL) {
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/* Copy the prefix */
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Buf_AddBytes(buf, m - pat, (Byte *) pat);
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/* skip the % */
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pat = m + 1;
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}
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/* Copy the pattern */
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Buf_AddBytes(buf, len, (Byte *) src);
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/* append the rest */
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Buf_AddBytes(buf, strlen(pat), (Byte *) pat);
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}
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