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Merge pull request #19 from melloc/split-fs-from-array 

Fix calling split() with a third argument that lives in the target array
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onetrueawk 2019-01-21 14:19:24 -05:00 committed by GitHub
parent 0fd6135c23 5a8a060bc3
commit c154c3cb82
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 16 additions and 5 deletions
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5
bugs-fixed/README
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@ -46,3 +46,8 @@ wouldn't always be generated before being needed.
13. subsep-overflow: The length of SUBSEP needs to be rechecked after
calling execute(), in case SUBSEP itself has been changed.
14. split-fs-from-array: If the third argument to split() comes from the
array passed as the second argument, then split() would previously read
from the freed memory and possibly produce incorrect results (depending
on the system's malloc()/free() behaviour.)

5
bugs-fixed/split-fs-from-array.awk Normal file
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@ -0,0 +1,5 @@
BEGIN {
a[1] = "elephantie"
a[2] = "e"
print split(a[1],a,a[2]), a[2], a[3], split(a[2],a,a[2])
}

1
bugs-fixed/split-fs-from-array.ok Normal file
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@ -0,0 +1 @@
4 l phanti 2

10
run.c
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@ -1247,8 +1247,9 @@ Cell *split(Node **a, int nnn) /* split(a[0], a[1], a[2]); a[3] is type */
{
Cell *x = 0, *y, *ap;
char *s, *origs;
char *fs, *origfs = NULL;
int sep;
char *t, temp, num[50], *fs = 0;
char *t, temp, num[50];
int n, tempstat, arg3type;
y = execute(a[0]); /* source string */
@ -1258,7 +1259,8 @@ Cell *split(Node **a, int nnn) /* split(a[0], a[1], a[2]); a[3] is type */
fs = getsval(fsloc);
else if (arg3type == STRING) { /* split(str,arr,"string") */
x = execute(a[2]);
fs = getsval(x);
origfs = fs = strdup(getsval(x));
tempfree(x);
} else if (arg3type == REGEXPR)
fs = "(regexpr)"; /* split(str,arr,/regexpr/) */
else
@ -1373,9 +1375,7 @@ Cell *split(Node **a, int nnn) /* split(a[0], a[1], a[2]); a[3] is type */
tempfree(ap);
tempfree(y);
free(origs);
if (a[2] != 0 && arg3type == STRING) {
tempfree(x);
}
free(origfs);
x = gettemp();
x->tval = NUM;
x->fval = n;