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Fix printing of weird errno's: negative values were printed as large

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unsigned's; null termination was only guaranteed for the first call.

Fix lint: don't declare externs internally; they were both out of date.
This commit is contained in:
Bruce Evans 1994-09-05 13:37:43 +00:00
parent 7e80dad5c6
commit 5ec11cf0bb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=2505
1 changed files with 9 additions and 5 deletions
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14
lib/libc/string/strerror.c
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@ -35,14 +35,13 @@
static char sccsid[] = "@(#)strerror.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <stdio.h>
#include <string.h>
char *
strerror(num)
int num;
{
extern int sys_nerr;
extern char *sys_errlist[];
#define UPREFIX "Unknown error: "
static char ebuf[40] = UPREFIX; /* 64-bit number + slop */
register unsigned int errnum;
@ -51,17 +50,22 @@ strerror(num)
errnum = num; /* convert to unsigned */
if (errnum < sys_nerr)
return(sys_errlist[errnum]);
return ((char *)sys_errlist[errnum]);
/* Do this by hand, so we don't include stdio(3). */
/* Do this by hand, so we don't link to stdio(3). */
t = tmp;
if (num < 0)
errnum = -errnum;
do {
*t++ = "0123456789"[errnum % 10];
} while (errnum /= 10);
if (num < 0)
*t++ = '-';
for (p = ebuf + sizeof(UPREFIX) - 1;;) {
*p++ = *--t;
if (t <= tmp)
break;
}
return(ebuf);
*p = '\0';
return (ebuf);
}