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awk: initialize records fully in recinit()

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when using records in BEGIN, we would read
from the field table before we read into it;
this ensures that the fields are an empty
string before we start touching their contents.
This commit is contained in:
Ori Bernstein 2022-06-25 18:58:55 +00:00
parent 5ee86cf824
commit 5579176f4a
1 changed files with 3 additions and 1 deletions
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2
sys/src/cmd/awk/lib.c
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@ -54,11 +54,13 @@ static Cell dollar1 = { OCELL, CFLD, nil, "", 0.0, FLD|STR|DONTFREE };
void recinit(unsigned int n) void recinit(unsigned int n)
{ {
assert(n > 0);
record = (char *) malloc(n); record = (char *) malloc(n);
fields = (char *) malloc(n); fields = (char *) malloc(n);
fldtab = (Cell **) malloc((nfields+1) * sizeof(Cell *)); fldtab = (Cell **) malloc((nfields+1) * sizeof(Cell *));
if (record == nil || fields == nil || fldtab == nil) if (record == nil || fields == nil || fldtab == nil)
FATAL("out of space for $0 and fields"); FATAL("out of space for $0 and fields");
record[0] = '\0';
fldtab[0] = (Cell *) malloc(sizeof (Cell)); fldtab[0] = (Cell *) malloc(sizeof (Cell));
*fldtab[0] = dollar0; *fldtab[0] = dollar0;
fldtab[0]->sval = record; fldtab[0]->sval = record;