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Yet^2 another fix for the line continuation bug.

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The fundamental problem with the original code is that it accesses
p[-2] which is one before the beginning of the input buffer for
empty lines.  rev.1.6 just moved the problem from failures when
p[-2] happens to be '\\' to failures when it happens to be '\0'.
rev.1.5 was confused about the trailing newline and other things.

I went back to rev.1.5 and fixed it.  The result is the same as
Keith Bostic's final version in PR 1356 except it loses more
gracefully for excessively long input lines.
This commit is contained in:
Bruce Evans 1996-07-17 12:18:51 +00:00
parent 65d98215ea
commit 49e6559936
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=17195
1 changed files with 5 additions and 5 deletions
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10
usr.bin/sed/compile.c
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@ -615,7 +615,7 @@ compile_tr(p, transtab)
static char *
compile_text()
{
int asize, size;
int asize, esc_nl, size;
char *text, *p, *op, *s;
char lbuf[_POSIX2_LINE_MAX + 1];
@ -626,13 +626,13 @@ compile_text()
op = s = text + size;
p = lbuf;
EATSPACE();
for (; *p != '\0'; p++) {
if (*p == '\\')
*p++ = '\0';
for (esc_nl = 0; *p != '\0'; p++) {
if (*p == '\\' && p[1] != '\0' && *++p == '\n')
esc_nl = 1;
*s++ = *p;
}
size += s - op;
if (p[-2] != '\0') {
if (!esc_nl) {
*s = '\0';
break;
}