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Diffstat (limited to 'usr.bin/mail/strings.c')
| -rw-r--r-- | usr.bin/mail/strings.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/usr.bin/mail/strings.c b/usr.bin/mail/strings.c new file mode 100644 index 0000000..ec9334e --- /dev/null +++ b/usr.bin/mail/strings.c @@ -0,0 +1,124 @@ +/* + * Copyright (c) 1980, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +#if 0 +static char sccsid[] = "@(#)strings.c 8.1 (Berkeley) 6/6/93"; +#endif +#endif /* not lint */ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +/* + * Mail -- a mail program + * + * String allocation routines. + * Strings handed out here are reclaimed at the top of the command + * loop each time, so they need not be freed. + */ + +#include "rcv.h" +#include "extern.h" + +/* + * Allocate size more bytes of space and return the address of the + * first byte to the caller. An even number of bytes are always + * allocated so that the space will always be on a word boundary. + * The string spaces are of exponentially increasing size, to satisfy + * the occasional user with enormous string size requests. + */ + +char * +salloc(int size) +{ + char *t; + int s, index; + struct strings *sp; + + s = size; + s += (sizeof(char *) - 1); + s &= ~(sizeof(char *) - 1); + index = 0; + for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) { + if (sp->s_topFree == NULL && (STRINGSIZE << index) >= s) + break; + if (sp->s_nleft >= s) + break; + index++; + } + if (sp >= &stringdope[NSPACE]) + errx(1, "String too large"); + if (sp->s_topFree == NULL) { + index = sp - &stringdope[0]; + if ((sp->s_topFree = malloc(STRINGSIZE << index)) == NULL) + err(1, "No room for space %d", index); + sp->s_nextFree = sp->s_topFree; + sp->s_nleft = STRINGSIZE << index; + } + sp->s_nleft -= s; + t = sp->s_nextFree; + sp->s_nextFree += s; + return (t); +} + +/* + * Reset the string area to be empty. + * Called to free all strings allocated + * since last reset. + */ +void +sreset(void) +{ + struct strings *sp; + int index; + + if (noreset) + return; + index = 0; + for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) { + if (sp->s_topFree == NULL) + continue; + sp->s_nextFree = sp->s_topFree; + sp->s_nleft = STRINGSIZE << index; + index++; + } +} + +/* + * Make the string area permanent. + * Meant to be called in main, after initialization. + */ +void +spreserve(void) +{ + struct strings *sp; + + for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) + sp->s_topFree = NULL; +} |
