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Fix a bug in sed(1)'s "s" command wherein if an escape ("\" character)

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was initiated at the last character of the line buffer, the Wrong
Thing was done and sed barfed by interpreting the following NUL byte
as a digit.  Instead, pull up the next buffer and record that the "\"
was last seen.
This commit is contained in:
Brian Feldman 2002-06-01 13:25:47 +00:00
parent c83fca1f1f
commit f020c7fa88
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=97703
1 changed files with 24 additions and 4 deletions
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28
usr.bin/sed/compile.c
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@ -467,7 +467,7 @@ compile_subst(p, s)
int asize, size;
u_char ref;
char c, *text, *op, *sp;
int more = 1;
int more = 1, sawesc = 0;
c = *p++; /* Terminator character */
if (c == '\0')
@ -482,9 +482,29 @@ compile_subst(p, s)
do {
op = sp = text + size;
for (; *p; p++) {
if (*p == '\\') {
p++;
if (strchr("123456789", *p) != NULL) {
if (*p == '\\' || sawesc) {
/*
* If this is a continuation from the last
* buffer, we won't have a character to
* skip over.
*/
if (sawesc)
sawesc = 0;
else
p++;
if (*p == '\0') {
/*
* This escaped character is continued
* in the next part of the line. Note
* this fact, then cause the loop to
* exit w/ normal EOL case and reenter
* above with the new buffer.
*/
sawesc = 1;
p--;
continue;
} else if (strchr("123456789", *p) != NULL) {
*sp++ = '\\';
ref = *p - '0';
if (s->re != NULL &&