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sort: readability; check strndup return value

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This commit is contained in:
Jakob Kramer 2014-04-30 16:08:11 +02:00 committed by sin
parent f8a216a18c
commit 0bc6b1377b
1 changed files with 18 additions and 10 deletions
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28
sort.c
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@ -181,14 +181,16 @@ parse_keydef(struct keydef *kd, char *s)
static char *
next_nonblank(char *s)
{
for(; *s && isblank(*s); s++);
while(*s && isblank(*s))
s++;
return s;
}
static char *
next_blank(char *s)
{
for(; *s && !isblank(*s); s++);
while(*s && !isblank(*s))
s++;
return s;
}
@ -197,29 +199,35 @@ columns(char *line, const struct keydef *kd)
{
char *rest;
char *start, *end;
char *res;
unsigned int i;
for(rest = line, i = 0; i < kd->start_column; i++) {
rest = line;
for(i = 0; i < kd->start_column; i++) {
if(i != 0)
rest = next_blank(rest);
rest = next_nonblank(rest);
}
for(i = 1; i < kd->start_char && !isblank(*rest); i++, rest++);
for(i = 1; i < kd->start_char && *rest && !isblank(*rest); i++)
rest++;
start = rest;
if(kd->end_column) {
for(rest = line, i = 0; i < kd->end_column; i++) {
rest = line;
for(i = 0; i < kd->end_column; i++) {
if(i != 0)
rest = next_blank(rest);
rest = next_nonblank(rest);
}
if(kd->end_char)
for(i = 1; i < kd->end_char && *rest && !isblank(*rest); i++, rest++);
for(i = 1; i < kd->end_char && *rest && !isblank(*rest); i++)
rest++;
else
rest = next_blank(rest);
end = rest;
} else {
end = rest - 1;
} else
end = rest + strlen(rest);
}
return strndup(start, end - start);
if((res = strndup(start, end - start)) == NULL)
enprintf(2, "strndup:");
return res;
}