/* Replacements for routines missing on some systems.
- Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
+ Copyright (C) 1995-2005 Free Software Foundation, Inc.
This file is part of GNU Wget.
#include <stdio.h>
#include <stdlib.h>
-#ifdef HAVE_STRING_H
-# include <string.h>
-#else
-# include <strings.h>
-#endif /* HAVE_STRING_H */
+#include <string.h>
-#include <sys/types.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
-#include <limits.h>
#include <errno.h>
-#ifndef errno
-extern int errno;
-#endif
#include "wget.h"
-#ifndef HAVE_STRERROR
-/* A strerror() clone, for systems that don't have it. */
-char *
-strerror (int err)
-{
- /* This loses on a system without `sys_errlist'. */
- extern char *sys_errlist[];
- return sys_errlist[err];
-}
-#endif /* not HAVE_STRERROR */
-
-/* Some systems don't have some str* functions in libc. Here we
- define them. The same goes for strptime. */
+/* Some systems lack certain functions normally taken for granted.
+ For example, Windows doesn't have strptime, and some systems lack
+ strcasecmp and strncasecmp. This file should contain fallback
+ implementations of the missing functions. It should *not* define
+ new Wget-specific functions -- those should placed in utils.c or
+ elsewhere. */
+\f
+/* strcasecmp and strncasecmp apparently originated with BSD 4.4.
+ SUSv3 seems to be the only standard out there (that I can find)
+ that requires their existence, so there are systems that lack them
+ still in use. Note that these don't get defined under Windows
+ because mswindows.h defines them to the equivalent Windows
+ functions stricmp and strnicmp. */
#ifndef HAVE_STRCASECMP
/* From GNU libc. */
return c1 - c2;
}
#endif /* not HAVE_STRNCASECMP */
-
-#ifndef HAVE_STRSTR
-/* From GNU libc 2.0.6. */
-/* Return the first ocurrence of NEEDLE in HAYSTACK. */
-/*
- * My personal strstr() implementation that beats most other algorithms.
- * Until someone tells me otherwise, I assume that this is the
- * fastest implementation of strstr() in C.
- * I deliberately chose not to comment it. You should have at least
- * as much fun trying to understand it, as I had to write it :-).
- *
- * Stephen R. van den Berg, berg@pool.informatik.rwth-aachen.de */
-typedef unsigned chartype;
-
-char *
-strstr (phaystack, pneedle)
- const char *phaystack;
- const char *pneedle;
-{
- register const unsigned char *haystack, *needle;
- register chartype b, c;
-
- haystack = (const unsigned char *) phaystack;
- needle = (const unsigned char *) pneedle;
-
- b = *needle;
- if (b != '\0')
- {
- haystack--; /* possible ANSI violation */
- do
- {
- c = *++haystack;
- if (c == '\0')
- goto ret0;
- }
- while (c != b);
-
- c = *++needle;
- if (c == '\0')
- goto foundneedle;
- ++needle;
- goto jin;
-
- for (;;)
- {
- register chartype a;
- register const unsigned char *rhaystack, *rneedle;
-
- do
- {
- a = *++haystack;
- if (a == '\0')
- goto ret0;
- if (a == b)
- break;
- a = *++haystack;
- if (a == '\0')
- goto ret0;
-shloop: }
- while (a != b);
-
-jin: a = *++haystack;
- if (a == '\0')
- goto ret0;
-
- if (a != c)
- goto shloop;
-
- rhaystack = haystack-- + 1;
- rneedle = needle;
- a = *rneedle;
-
- if (*rhaystack == a)
- do
- {
- if (a == '\0')
- goto foundneedle;
- ++rhaystack;
- a = *++needle;
- if (*rhaystack != a)
- break;
- if (a == '\0')
- goto foundneedle;
- ++rhaystack;
- a = *++needle;
- }
- while (*rhaystack == a);
-
- needle = rneedle; /* took the register-poor approach */
-
- if (a == '\0')
- break;
- }
- }
-foundneedle:
- return (char*) haystack;
-ret0:
- return 0;
-}
-#endif /* not HAVE_STRSTR */
+\f
+/* strpbrk is required by POSIX and C99, but it is missing from some
+ older systems and from Windows. */
#ifndef HAVE_STRPBRK
/* Find the first ocurrence in S of any character in ACCEPT. */
return 0;
}
#endif /* HAVE_STRPBRK */
+\f
+/* mktime is a BSD 4.3 function also required by POSIX and C99. I
+ don't know if there is a widely used system that lacks it, so it
+ might be a candidate for removal. */
#ifndef HAVE_MKTIME
/* From GNU libc 2.0. */
#endif
#ifndef __P
-# define __P(args) PARAMS (args)
+# define __P(args) args
#endif /* Not __P. */
#ifndef CHAR_BIT
weak_alias (mktime, timelocal)
#endif
#endif /* not HAVE_MKTIME */
-
+\f
+/* strptime is required by POSIX, but it is missing from Windows,
+ which means we must keep a fallback implementation. It is
+ reportedly missing or broken on many older systems as well. */
#ifndef HAVE_STRPTIME
/* From GNU libc 2.1.3. */
this is enough information for determining the date. */
#ifndef __P
-# define __P(args) PARAMS (args)
+# define __P(args) args
#endif /* not __P */
#if ! HAVE_LOCALTIME_R && ! defined localtime_r
{ 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
};
#endif
-
-#ifndef HAVE_MEMMOVE
-void *
-memmove (char *dest, const char *source, unsigned length)
-{
- char *d0 = dest;
- if (source < dest)
- /* Moving from low mem to hi mem; start at end. */
- for (source += length, dest += length; length; --length)
- *--dest = *--source;
- else if (source != dest)
- {
- /* Moving from hi mem to low mem; start at beginning. */
- for (; length; --length)
- *dest++ = *source++;
- }
- return (void *) d0;
-}
-#endif /* not HAVE_MEMMOVE */
-
-/* fnmatch is a POSIX function, but we include an implementation for
- the sake of systems that don't have it. Furthermore, according to
- anecdotal evidence, historical implementations of fnmatch are buggy
- and unreliable. So we use our version, except when compiling under
- systems where fnmatch is known to work (currently glibc.) */
+\f
+/* fnmatch is required by POSIX, but we include an implementation for
+ the sake of systems that don't have it, most notably Windows. Some
+ systems do have fnmatch, but Apache's installation process installs
+ its own fnmatch.h (incompatible with the system one!) in a system
+ include directory, effectively rendering fnmatch unusable. This
+ has been fixed with Apache 2, where fnmatch has been moved to apr
+ and given a prefix, but many systems out there are still (as of
+ this writing in 2005) broken and we must cater to them.
+
+ Additionally, according to anecdotal evidence and conventional
+ wisdom I lack courage to challenge, many implementations of fnmatch
+ are notoriously buggy and unreliable. So we use our version by
+ default, except when compiling under systems where fnmatch is known
+ to work (currently on GNU libc-based systems and Solaris.) */
#ifndef SYSTEM_FNMATCH
/* Match STRING against the filename pattern PATTERN, returning zero
if it matches, FNM_NOMATCH if not. This implementation comes from
an earlier version of GNU Bash. (It doesn't make sense to update
- it with a newer version because it adds a lot of features Wget
- doesn't use or care about.) */
+ it with a newer version because those versions add a lot of
+ features Wget doesn't use or care about.) */
int
fnmatch (const char *pattern, const char *string, int flags)
projects / wget / blobdiff