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Dynamically allocate line buffers, instead of assuming that all the

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world would fit into BUFSIZ.
This commit is contained in:
Joerg Wunsch 1995-11-15 15:01:01 +00:00
parent f3117d66d3
commit e6c267f18c
1 changed files with 31 additions and 6 deletions
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37
usr.bin/fmt/fmt.c
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@ -44,6 +44,7 @@ static char sccsid[] = "@(#)fmt.c 8.1 (Berkeley) 7/20/93";
#include <stdio.h>
#include <ctype.h>
#include <locale.h>
#include <stdlib.h>
/*
* fmt -- format the concatenation of input files or standard input
@ -136,9 +137,11 @@ main(argc, argv)
fmt(fi)
FILE *fi;
{
char linebuf[BUFSIZ], canonb[BUFSIZ];
static char *linebuf = 0, *canonb = 0;
register char *cp, *cp2, cc;
register int c, col;
#define CHUNKSIZE 1024
static int lbufsize = 0, cbufsize = 0;
c = getc(fi);
while (c != EOF) {
@ -147,7 +150,15 @@ fmt(fi)
* Leave tabs for now.
*/
cp = linebuf;
while (c != '\n' && c != EOF && cp-linebuf < BUFSIZ-1) {
while (c != '\n' && c != EOF) {
if (cp - linebuf >= lbufsize) {
int offset = cp - linebuf;
lbufsize += CHUNKSIZE;
linebuf = realloc(linebuf, lbufsize);
if(linebuf == 0)
abort();
cp = linebuf + offset;
}
if (c == '\b') {
if (cp > linebuf)
cp--;
@ -178,13 +189,27 @@ fmt(fi)
while (cc = *cp++) {
if (cc != '\t') {
col++;
if (cp2-canonb < BUFSIZ-1)
*cp2++ = cc;
if (cp2 - canonb >= cbufsize) {
int offset = cp2 - canonb;
cbufsize += CHUNKSIZE;
canonb = realloc(canonb, cbufsize);
if(canonb == 0)
abort();
cp2 = canonb + offset;
}
*cp2++ = cc;
continue;
}
do {
if (cp2-canonb < BUFSIZ-1)
*cp2++ = ' ';
if (cp2 - canonb >= cbufsize) {
int offset = cp2 - canonb;
cbufsize += CHUNKSIZE;
canonb = realloc(canonb, cbufsize);
if(canonb == 0)
abort();
cp2 = canonb + offset;
}
*cp2++ = ' ';
col++;
} while ((col & 07) != 0);
}