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cuserid: don't return truncated results

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checking the length also drops the need to pull in snprintf.
This commit is contained in:
Rich Felker 2021-02-13 13:54:00 -05:00
parent ef137da642
commit a75283d777
1 changed files with 5 additions and 1 deletions
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6
src/legacy/cuserid.c
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@ -2,6 +2,7 @@
#include <pwd.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
char *cuserid(char *buf)
{
@ -10,7 +11,10 @@ char *cuserid(char *buf)
long pwb[256];
if (getpwuid_r(geteuid(), &pw, (void *)pwb, sizeof pwb, &ppw))
return 0;
size_t len = strnlen(pw.pw_name, L_cuserid);
if (len == L_cuserid)
return 0;
if (!buf) buf = usridbuf;
snprintf(buf, L_cuserid, "%s", pw.pw_name);
memcpy(buf, pw.pw_name, len+1);
return buf;
}