[Bug libc/13154] New: strtol, et. al. clobber endptr when base is invalid

[bugdal at aerifal dot cx]

http://sourceware.org/bugzilla/show_bug.cgi?id=13154

             Bug #: 13154
           Summary: strtol, et. al. clobber endptr when base is invalid
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: bugdal@aerifal.cx
    Classification: Unclassified


ISO C does not specify any behavior for strtol-family function when base is
invalid, but POSIX specifies that the functions shall fail and set errno to
EINVAL in this case. glibc's implementation does fail and sets errno, but also
clobbers the pointer pointed to by the endptr argument (with NULL). This could
break applications which assume *endptr will always remain the same or advance
after a call to strtol, even in the presence of invalid input. I see nothing in
the standards that allows glibc's behavior.

Simple test case:

char *s = "123";
strtol(s, &s, 37);
assert(s);

Wide character versions and long long/intmax_t versions, and the corresponding
unsigned versions, are also affected.

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