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ash: fix $IFS handling in read. closes bug 235

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This commit is contained in:
Denis Vlasenko 2009-03-31 19:18:17 +00:00
parent 7566bae197
commit 46aeab9a34
3 changed files with 37 additions and 12 deletions
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31
shell/ash.c
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@ -12574,7 +12574,7 @@ readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
#endif
status = 0;
startword = 1;
startword = 2;
backslash = 0;
#if ENABLE_ASH_READ_TIMEOUT
if (timeout) /* NB: ensuring end_ms is nonzero */
@ -12582,6 +12582,8 @@ readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
#endif
STARTSTACKSTR(p);
do {
const char *is_ifs;
#if ENABLE_ASH_READ_TIMEOUT
if (end_ms) {
struct pollfd pfd[1];
@ -12611,26 +12613,35 @@ readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
continue;
}
if (!rflag && c == '\\') {
backslash++;
backslash = 1;
continue;
}
if (c == '\n')
break;
if (startword && *ifs == ' ' && strchr(ifs, c)) {
is_ifs = strchr(ifs, c);
if (startword && is_ifs) {
if (isspace(c))
continue;
/* non-space ifs char */
startword--;
if (startword == 1) /* first one? */
continue;
}
startword = 0;
if (ap[1] != NULL && strchr(ifs, c) != NULL) {
if (ap[1] != NULL && is_ifs) {
const char *beg;
STACKSTRNUL(p);
setvar(*ap, stackblock(), 0);
beg = stackblock();
setvar(*ap, beg, 0);
ap++;
startword = 1;
/* can we skip one non-space ifs? (2: yes) */
startword = isspace(c) ? 2 : 1;
STARTSTACKSTR(p);
} else {
continue;
}
put:
STPUTC(c, p);
}
}
/* end of do {} while: */
#if ENABLE_ASH_READ_NCHARS
while (--nchars);
@ -12643,8 +12654,8 @@ readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
#endif
STACKSTRNUL(p);
/* Remove trailing blanks */
while ((char *)stackblock() <= --p && strchr(ifs, *p) != NULL)
/* Remove trailing space ifs chars */
while ((char *)stackblock() <= --p && isspace(*p) && strchr(ifs, *p) != NULL)
*p = '\0';
setvar(*ap, stackblock(), 0);
while (*++ap != NULL)

7
shell/ash_test/ash-read/read_ifs.right Normal file
View File

@ -0,0 +1,7 @@
.a. .b. .c.
.a. .b. .c.
.a. .. .b,c.
.a. .. .b,c.
.a. .. .c.
.a. .. .c. .d.
.a. .. .b,c,d , ,.

7
shell/ash_test/ash-read/read_ifs.tests Executable file
View File

@ -0,0 +1,7 @@
printf 'a\t\tb\tc\n' | ( IFS=$(printf "\t") read a b c; echo ".$a. .$b. .$c." )
printf 'a\t\tb\tc\n' | ( IFS=$(printf " \t") read a b c; echo ".$a. .$b. .$c." )
printf 'a,,b,c\n' | ( IFS="," read a b c; echo ".$a. .$b. .$c." )
printf 'a,,b,c\n' | ( IFS=" ," read a b c; echo ".$a. .$b. .$c." )
printf 'a ,, c\n' | ( IFS=" ," read a b c; echo ".$a. .$b. .$c." )
printf 'a ,, c d\n' | ( IFS=" ," read a b c d; echo ".$a. .$b. .$c. .$d." )
printf ' a,,b,c,d , ,\n' | ( IFS=" ," read a b c; echo ".$a. .$b. .$c." )