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awk: next_input_file can return NULL, don't SEGV in this case.

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2011-09-07 20:01:39 +02:00
parent e8f36330d9
commit f65c5f5c54
1 changed files with 11 additions and 9 deletions
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20
editors/awk.c
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@ -2627,7 +2627,7 @@ static var *evaluate(node *op, var *res)
rsm = iF;
}
if (!rsm->F) {
if (!rsm || !rsm->F) {
setvar_i(intvar[ERRNO], errno);
setvar_i(res, -1);
break;
@ -2961,7 +2961,7 @@ static rstream *next_input_file(void)
#define rsm (G.next_input_file__rsm)
#define files_happen (G.next_input_file__files_happen)
FILE *F = NULL;
FILE *F;
const char *fname, *ind;
if (rsm.F)
@ -2969,19 +2969,21 @@ static rstream *next_input_file(void)
rsm.F = NULL;
rsm.pos = rsm.adv = 0;
do {
for (;;) {
if (getvar_i(intvar[ARGIND])+1 >= getvar_i(intvar[ARGC])) {
if (files_happen)
return NULL;
fname = "-";
F = stdin;
} else {
ind = getvar_s(incvar(intvar[ARGIND]));
fname = getvar_s(findvar(iamarray(intvar[ARGV]), ind));
if (fname && *fname && !is_assignment(fname))
F = xfopen_stdin(fname);
break;
}
} while (!F);
ind = getvar_s(incvar(intvar[ARGIND]));
fname = getvar_s(findvar(iamarray(intvar[ARGV]), ind));
if (fname && *fname && !is_assignment(fname)) {
F = xfopen_stdin(fname);
break;
}
}
files_happen = TRUE;
setvar_s(intvar[FILENAME], fname);