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authorRob Landley <rob@landley.net>2014-12-10 18:59:22 -0600
committerRob Landley <rob@landley.net>2014-12-10 18:59:22 -0600
commited053c0fa6ea2bb65be902d0ad437ab4f2031552 (patch)
tree43e95ca406b41b3a59cf4a2c9cba22de17287671 /toys/pending/sed.c
parentacb2d0ed74312da548e2b209732b2f7e67a65c23 (diff)
downloadtoybox-ed053c0fa6ea2bb65be902d0ad437ab4f2031552.tar.gz
Make unescape_delimited_string() copy the string so error reporting isn't so messed up.
Diffstat (limited to 'toys/pending/sed.c')
-rw-r--r--toys/pending/sed.c61
1 files changed, 26 insertions, 35 deletions
diff --git a/toys/pending/sed.c b/toys/pending/sed.c
index 607d737c..623307cc 100644
--- a/toys/pending/sed.c
+++ b/toys/pending/sed.c
@@ -665,48 +665,39 @@ static void do_sed(int fd, char *name)
}
}
-// Note: removing backslash escapes and null terminating edits the source
-// string, which could be from the environment space via -e, which could
-// screw up what "ps" sees, and I'm ok with that. (Modifying the environment
-// space like that means sed is very, very not reentrant.)
-
-// Ok, what happens if we xexec() sed with constant arguments then?
-// TODO: ^^^ that
-// also screws up error reporting for bad patterns
-
-// returns length of processed string, *pstr advances to next unused char,
-// if delim (or *delim) is 0 uses starting char as delimiter, otherwise
-// parses and saves delimiter from first character(s)
-// if rexex, ignore delimiter in [ranges]
-static int unescape_delimited_string(char **pstr, char *delim, int regex)
+// Copy chunk of string between two delimiters, converting printf escapes.
+// returns processed copy of string (0 if error), *pstr advances to next
+// unused char. if delim (or *delim) is 0 uses/saves starting char as delimiter
+// if regxex, ignore delimiter in [ranges]
+static char *unescape_delimited_string(char **pstr, char *delim, int regex)
{
char *to, *from, d;
- int rc;
to = from = *pstr;
if (!delim || !*delim) {
- if (!(d = *(from++))) return -1;
+ if (!(d = *(from++))) return 0;
if (d == '\\') d = *(from++);
- if (!d || d == '\\') return -1;
+ if (!d || d == '\\') return 0;
if (delim) *delim = d;
} else d = *delim;
+ to = delim = xmalloc(strlen(*pstr)+1);
while (*from != d) {
- if (!*from) return -1;
+ if (!*from) return 0;
// delimiter in regex character range doesn't count
if (*from == '[') {
int len = 1;
if (from[len] == ']') len++;
- while (from[len] != ']') if (!from[len++]) return -1;
+ while (from[len] != ']') if (!from[len++]) return 0;
memmove(to, from, ++len);
to += len;
from += len;
continue;
}
if (*from == '\\') {
- if (!from[1]) return -1;
+ if (!from[1]) return 0;
// Check escaped end delimiter before printf style escapes.
if (from[1] == d) from++;
@@ -722,11 +713,10 @@ static int unescape_delimited_string(char **pstr, char *delim, int regex)
}
*(to++) = *(from++);
}
- rc = to-*pstr;
*to = 0;
*pstr = from+1;
- return rc;
+ return delim;
}
// Translate primal pattern into walkable form.
@@ -776,13 +766,14 @@ static void jewel_of_judgement(char **pline, long len)
} else if (*line == '/' || *line == '\\') {
char *s = line;
- if (-1 == unescape_delimited_string(&line, 0, 1)) goto brand;
+ if (!(s = unescape_delimited_string(&line, 0, 1))) goto brand;
if (!*s) corwin->rmatch[i] = 0;
else {
xregcomp((void *)reg, s, (toys.optflags & FLAG_r)*REG_EXTENDED);
corwin->rmatch[i] = reg-toybuf;
reg += sizeof(regex_t);
}
+ free(s);
} else break;
}
@@ -815,8 +806,7 @@ static void jewel_of_judgement(char **pline, long len)
// get pattern (just record, we parse it later)
corwin->arg1 = reg - (char *)corwin;
- merlin = line;
- if (-1 == unescape_delimited_string(&line, &delim, 1)) goto brand;
+ if (!(merlin = unescape_delimited_string(&line, &delim, 1))) goto brand;
// get replacement - don't replace escapes because \1 and \& need
// processing later, after we replace \\ with \ we can't tell \\1 from \1
@@ -850,6 +840,7 @@ static void jewel_of_judgement(char **pline, long len)
if (!*merlin) corwin->arg1 = 0;
else xregcomp((void *)(corwin->arg1 + (char *)corwin), merlin,
((toys.optflags & FLAG_r)*REG_EXTENDED)|((corwin->sflags&1)*REG_ICASE));
+ free(merlin);
if (*line == 'w') {
line++;
goto writenow;
@@ -886,19 +877,19 @@ writenow:
line = cc;
if (delim) line += 2;
} else if (c == 'y') {
- char *s = line, delim = 0;
- int len1, len2;
+ char *s, delim = 0;
+ int len;
- if (-1 == (len1 = unescape_delimited_string(&line, &delim, 0)))
- goto brand;
+ if (!(s = unescape_delimited_string(&line, &delim, 0))) goto brand;
corwin->arg1 = reg-(char *)corwin;
- reg = extend_string((void *)&corwin, s, reg-(char *)corwin, len1);
- s = line;
+ len = strlen(s);
+ reg = extend_string((void *)&corwin, s, reg-(char *)corwin, len);
+ free(s);
corwin->arg2 = reg-(char *)corwin;
- if (-1 == (len2 = unescape_delimited_string(&line, &delim, 0)))
- goto brand;
- if (len1 != len2) goto brand;
- reg = extend_string((void *)&corwin, s, reg-(char*)corwin, len2);
+ if (!(s = unescape_delimited_string(&line, &delim, 0))) goto brand;
+ if (len != strlen(s)) goto brand;
+ reg = extend_string((void *)&corwin, s, reg-(char*)corwin, len);
+ free(s);
} else if (strchr("abcirtTw:", c)) {
int end, class;