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cuserid: support invocation with a null pointer argument

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this function was removed from the standard in 2001 but appeared in
SUSv2 with an obligation to support calls with a null pointer
argument, using a static buffer.
This commit is contained in:
Sören Tempel 2020-01-29 12:20:07 +01:00 • committed by Rich Felker
parent e5d2823631
commit ef137da642
1 changed files with 2 additions and 0 deletions
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2
src/legacy/cuserid.c
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@ -5,10 +5,12 @@
char *cuserid(char *buf)
{
static char usridbuf[L_cuserid];
struct passwd pw, *ppw;
long pwb[256];
if (getpwuid_r(geteuid(), &pw, (void *)pwb, sizeof pwb, &ppw))
return 0;
if (!buf) buf = usridbuf;
snprintf(buf, L_cuserid, "%s", pw.pw_name);
return buf;
}