Hojun-Cho/strans
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str: drop argument checks no caller can trip

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sinit's nil and negative-length tests and stoutf's zero-size test only
had test callers; every real caller passes a buffer and its size. The
len > n check after fullrune succeeded could never fire.
This commit is contained in:
Hojun-Cho
2026-08-16 18:36:40 +09:00
parent 723a271a9c
commit 0aef3506b6
2 changed files with 4 additions and 20 deletions
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15
str.c
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@@ -1,6 +1,7 @@
#include "dat.h"
#include "fn.h"
/* Fills s from n bytes of UTF-8; whole, valid, and at most Maxrunes. */
int
sinit(Str *s, char *src, int n)
{
@@ -8,19 +9,12 @@ sinit(Str *s, char *src, int n)
Rune r;
int len;
if(s == nil)
return 0;
s->n = 0;
if(n < 0 || (n > 0 && src == nil))
return 0;
while(n > 0){
if(tmp.n >= Maxrunes)
return 0;
if(!fullrune(src, n))
if(tmp.n >= Maxrunes || !fullrune(src, n))
return 0;
len = chartorune(&r, src);
if(len > n || (r == Runeerror && len == 1) ||
(r >= 0xd800 && r <= 0xdfff))
if((r == Runeerror && len == 1) || (r >= 0xd800 && r <= 0xdfff))
return 0;
tmp.r[tmp.n++] = r;
src += len;
@@ -75,14 +69,13 @@ scmp(Str *a, Str *b)
return 0;
}
/* UTF-8 of s into buf[sz], NUL-terminated, whole runes only. */
int
stoutf(Str *s, char *buf, int sz)
{
char tmp[UTFmax];
int i, n, len;
if(sz <= 0)
return 0;
n = 0;
for(i = 0; i < s->n; i++){
len = runetochar(tmp, &s->r[i]);