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echo hello | ./sed 'sl[l]lxl' 

historically outputs:
hexlo
This commit is contained in:
alm 1994-04-17 04:19:27 +00:00
parent 590e7a9105
commit b1dcef2867
1 changed files with 35 additions and 2 deletions
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37
usr.bin/sed/compile.c
View File

@ -37,7 +37,7 @@
#ifndef lint
/* from: static char sccsid[] = "@(#)compile.c 8.1 (Berkeley) 6/6/93"; */
static char *rcsid = "$Id: compile.c,v 1.10 1994/02/03 23:44:46 cgd Exp $";
static char *rcsid = "$Id: compile.c,v 1.11 1994/04/17 04:19:27 alm Exp $";
#endif /* not lint */
#include <sys/types.h>
@ -65,6 +65,7 @@ static struct labhash {
} *labels[LHSZ];
static char *compile_addr __P((char *, struct s_addr *));
static char *compile_ccl __P((char **, char *));
static char *compile_delimited __P((char *, char *));
static char *compile_flags __P((char *, struct s_subst *));
static char *compile_re __P((char *, regex_t **));
@ -346,7 +347,13 @@ compile_delimited(p, d)
else if (c == '\n')
err(COMPILE, "newline can not be used as a string delimiter");
while (*p) {
if (*p == '\\' && p[1] == c)
if (*p == '[') {
if ((d = compile_ccl(&p, d)) == NULL)
err(COMPILE, "unbalanced brackets ([])");
continue;
} else if (*p == '\\' && p[1] == '[') {
*d++ = *p++;
} else if (*p == '\\' && p[1] == c)
p++;
else if (*p == '\\' && p[1] == 'n') {
*d++ = '\n';
@ -363,6 +370,32 @@ compile_delimited(p, d)
return (NULL);
}
/* compile_ccl: expand a POSIX character class */
static char *
compile_ccl(sp, t)
char **sp;
char *t;
{
int c, d;
char *s = *sp;
*t++ = *s++;
if (*s == '^')
*t++ = *s++;
if (*s == ']')
*t++ = *s++;
for (; *s && (*t = *s) != ']'; s++, t++)
if (*s == '[' && ((d = *(s+1)) == '.' || d == ':' || d == '=')) {
*++t = *++s, t++, s++;
for (c = *s; (*t = *s) != ']' || c != d; s++, t++)
if ((c = *s) == '\0')
return NULL;
} else if (*s == '\\' && s[1] == 'n')
*t = '\n', s++;
return (*s == ']') ? *sp = ++s, ++t : NULL;
}
/*
* Get a regular expression. P points to the delimiter of the regular
* expression; repp points to the address of a regexp pointer. Newline