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ensure that errno is not modified inside Curl_strerror()

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This commit is contained in:
Yang Tse 2008-09-12 10:51:57 +00:00
parent 77bafd823b
commit c3d1b07c45
1 changed files with 39 additions and 33 deletions
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72
lib/strerror.c
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@ -24,10 +24,11 @@
#include "setup.h"
#ifdef HAVE_STRERROR_R
#if !defined(HAVE_POSIX_STRERROR_R) && !defined(HAVE_GLIBC_STRERROR_R)
#error "you MUST have either POSIX or glibc strerror_r if strerror_r is found"
#endif /* !POSIX && !glibc */
#endif /* HAVE_STRERROR_R */
# if (!defined(HAVE_POSIX_STRERROR_R) && !defined(HAVE_GLIBC_STRERROR_R)) || \
(defined(HAVE_POSIX_STRERROR_R) && defined(HAVE_GLIBC_STRERROR_R))
# error "strerror_r MUST be either POSIX-style or glibc-style"
# endif
#endif
#include <curl/curl.h>
#include <stdlib.h>
@ -43,14 +44,6 @@
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
#if defined(HAVE_STRERROR_R) && defined(HAVE_NO_STRERROR_R_DECL)
#ifdef HAVE_POSIX_STRERROR_R
/* seen on AIX 5100-02 gcc 2.9 */
extern int strerror_r(int errnum, char *strerrbuf, size_t buflen);
#else
extern char *strerror_r(int errnum, char *buf, size_t buflen);
#endif
#endif
const char *
curl_easy_strerror(CURLcode error)
@ -590,6 +583,7 @@ const char *Curl_strerror(struct connectdata *conn, int err)
{
char *buf, *p;
size_t max;
int old_errno = ERRNO;
DEBUGASSERT(conn);
DEBUGASSERT(err >= 0);
@ -601,17 +595,15 @@ const char *Curl_strerror(struct connectdata *conn, int err)
#ifdef USE_WINSOCK
#ifdef _WIN32_WCE
buf[0]=0;
{
wchar_t wbuf[256];
wbuf[0] = L'\0';
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, err,
LANG_NEUTRAL, wbuf, sizeof(wbuf)/sizeof(wchar_t), NULL);
wcstombs(buf,wbuf,max);
}
#else
/* 'sys_nerr' is the maximum errno number, it is not widely portable */
if(err >= 0 && err < sys_nerr)
strncpy(buf, strerror(err), max);
@ -622,34 +614,43 @@ const char *Curl_strerror(struct connectdata *conn, int err)
snprintf(buf, max, "Unknown error %d (%#x)", err, err);
}
#endif
#else /* not USE_WINSOCK coming up */
/* These should be atomic and hopefully thread-safe */
#ifdef HAVE_STRERROR_R
/* There are two different APIs for strerror_r(). The POSIX and the GLIBC
versions. */
#ifdef HAVE_POSIX_STRERROR_R
strerror_r(err, buf, max);
/* this may set errno to ERANGE if insufficient storage was supplied via
'strerrbuf' and 'buflen' to contain the generated message string, or
EINVAL if the value of 'errnum' is not a valid error number.*/
#else
#if defined(HAVE_STRERROR_R) && defined(HAVE_POSIX_STRERROR_R)
/*
* The POSIX-style strerror_r() may set errno to ERANGE if insufficient
* storage is supplied via 'strerrbuf' and 'buflen' to hold the generated
* message string, or EINVAL if 'errnum' is not a valid error number.
*/
if(0 != strerror_r(err, buf, max)) {
if('\0' == buf[0])
snprintf(buf, max, "Unknown error %d", err);
}
#elif defined(HAVE_STRERROR_R) && defined(HAVE_GLIBC_STRERROR_R)
/*
* The glibc-style strerror_r() only *might* use the buffer we pass to
* the function, but it always returns the error message as a pointer,
* so we must copy that string unconditionally (if non-NULL).
*/
{
/* HAVE_GLIBC_STRERROR_R */
char buffer[256];
char *msg = strerror_r(err, buffer, sizeof(buffer));
/* this version of strerror_r() only *might* use the buffer we pass to
the function, but it always returns the error message as a pointer,
so we must copy that string unconditionally (if non-NULL) */
if(msg)
strncpy(buf, msg, max);
else
snprintf(buf, max, "Unknown error %d", err);
}
#endif /* end of HAVE_GLIBC_STRERROR_R */
#else /* HAVE_STRERROR_R */
strncpy(buf, strerror(err), max);
#endif /* end of HAVE_STRERROR_R */
#else
{
char *msg = strerror(err);
if(msg)
strncpy(buf, msg, max);
else
snprintf(buf, max, "Unknown error %d", err);
}
#endif
#endif /* end of ! USE_WINSOCK */
buf[max] = '\0'; /* make sure the string is zero terminated */
@ -659,6 +660,10 @@ const char *Curl_strerror(struct connectdata *conn, int err)
*p = '\0';
if((p = strrchr(buf,'\r')) != NULL && (p - buf) >= 1)
*p = '\0';
if(old_errno != ERRNO)
SET_ERRNO(old_errno);
return buf;
}
@ -680,6 +685,7 @@ const char *Curl_idn_strerror (struct connectdata *conn, int err)
buf = conn->syserr_buf;
max = sizeof(conn->syserr_buf)-1;
*buf = '\0';
#ifndef CURL_DISABLE_VERBOSE_STRINGS
switch ((Idna_rc)err) {