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fix error return value for cuserid 

the historical function was specified to return an empty string in the
caller-provided buffer, not a null pointer, to indicate error when the
argument is non-null. only when the argument is null should it return
a null pointer on error.
This commit is contained in:
Rich Felker 2021-02-13 14:03:23 -05:00
parent cc577d0e05
commit 49b6df3d9f
1 changed files with 3 additions and 2 deletions
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5
src/legacy/cuserid.c
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@ -9,12 +9,13 @@ char *cuserid(char *buf)
static char usridbuf[L_cuserid];
struct passwd pw, *ppw;
long pwb[256];
if (buf) *buf = 0;
getpwuid_r(geteuid(), &pw, (void *)pwb, sizeof pwb, &ppw);
if (!ppw)
return 0;
return buf;
size_t len = strnlen(pw.pw_name, L_cuserid);
if (len == L_cuserid)
return 0;
return buf;
if (!buf) buf = usridbuf;
memcpy(buf, pw.pw_name, len+1);
return buf;