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39871: cut down number of strlen()s in getstrvalue()

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This commit is contained in:
Sebastian Gniazdowski 2016-11-08 05:37:53 -08:00 • committed by Peter Stephenson
parent a57977d01a
commit 06e4ec853a
3 changed files with 32 additions and 6 deletions
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17
Src/params.c
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@ -2060,6 +2060,7 @@ getstrvalue(Value v)
{
char *s, **ss;
char buf[BDIGBUFSIZE];
int len = -1;
if (!v)
return hcalloc(1);
@ -2237,22 +2238,30 @@ getstrvalue(Value v)
return s;
if (v->start < 0) {
v->start += strlen(s);
len = strlen(s);
v->start += len;
if (v->start < 0)
v->start = 0;
}
if (v->end < 0) {
v->end += strlen(s);
if (len < 0)
len = strlen(s);
v->end += len;
if (v->end >= 0) {
char *eptr = s + v->end;
if (*eptr)
v->end += MB_METACHARLEN(eptr);
}
}
s = (v->start > (int)strlen(s)) ? dupstring("") : dupstring(s + v->start);
if (len < 0)
len = strlen(s);
s = (v->start > len) ? dupstring("") :
dupstring_wlen(s + v->start, len - v->start);
if (v->end <= v->start)
s[0] = '\0';
else if (v->end - v->start <= (int)strlen(s))
else if (v->end - v->start <= len - v->start)
s[v->end - v->start] = '\0';
return s;