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awkgetline: do not access unitialized data on EOF

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getrec() returns 0 on EOF and leaves the contents of buf unchanged.
Fixes #133.
This commit is contained in:
Todd C. Miller 2021-11-01 11:58:54 -06:00
parent 275a80ff33
commit 1debe1993f
1 changed files with 8 additions and 6 deletions
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2
run.c
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@ -447,6 +447,7 @@ Cell *awkgetline(Node **a, int n) /* get next line from specific input */
n = getrec(&record, &recsize, true); n = getrec(&record, &recsize, true);
else { /* getline var */ else { /* getline var */
n = getrec(&buf, &bufsize, false); n = getrec(&buf, &bufsize, false);
if (n > 0) {
x = execute(a[0]); x = execute(a[0]);
setsval(x, buf); setsval(x, buf);
if (is_number(x->sval, & result)) { if (is_number(x->sval, & result)) {
@ -456,6 +457,7 @@ Cell *awkgetline(Node **a, int n) /* get next line from specific input */
tempfree(x); tempfree(x);
} }
} }
}
setfval(r, (Awkfloat) n); setfval(r, (Awkfloat) n);
free(buf); free(buf);
return r; return r;