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/* Copyright (C) 2000,2001, 2006, 2008 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 3, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; see the file COPYING.LESSER. If
* not, write to the Free Software Foundation, Inc., 51 Franklin
* Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* From NEWS:
*
* * New primitive: `simple-format', affects `scm-error', scm_display_error, & scm_error message strings
*
* (ice-9 boot) makes `format' an alias for `simple-format' until possibly
* extended by the more sophisticated version in (ice-9 format)
*
* (simple-format port message . args)
* Write MESSAGE to DESTINATION, defaulting to `current-output-port'.
* MESSAGE can contain ~A (was %s) and ~S (was %S) escapes. When printed,
* the escapes are replaced with corresponding members of ARGS:
* ~A formats using `display' and ~S formats using `write'.
* If DESTINATION is #t, then use the `current-output-port',
* if DESTINATION is #f, then return a string containing the formatted text.
* Does not add a trailing newline."
*
* The two C procedures: scm_display_error and scm_error, as well as the
* primitive `scm-error', now use scm_format to do their work. This means
* that the message strings of all code must be updated to use ~A where %s
* was used before, and ~S where %S was used before.
*
* During the period when there still are a lot of old Guiles out there,
* you might want to support both old and new versions of Guile.
*
* There are basically two methods to achieve this. Both methods use
* autoconf. Put
*
* AC_CHECK_FUNCS(scm_simple_format)
*
* in your configure.in.
*
* Method 1: Use the string concatenation features of ANSI C's
* preprocessor.
*
* In C:
*
* #ifdef HAVE_SCM_SIMPLE_FORMAT
* #define FMT_S "~S"
* #else
* #define FMT_S "%S"
* #endif
*
* Then represent each of your error messages using a preprocessor macro:
*
* #define E_SPIDER_ERROR "There's a spider in your " ## FMT_S ## "!!!"
*
* In Scheme:
*
* (define fmt-s (if (defined? 'simple-format) "~S" "%S"))
* (define make-message string-append)
*
* (define e-spider-error
* (make-message "There's a spider in your " fmt-s "!!!"))
*
* Method 2: Use the oldfmt function found in doc/oldfmt.c.
*
* In C:
*
* scm_misc_error ("picnic", scm_c_oldfmt0 ("There's a spider in your ~S!!!"),
* ...);
*
* In Scheme:
*
* (scm-error 'misc-error "picnic" (oldfmt "There's a spider in your ~S!!!")
* ...)
*
*/
/*
* Take a format string FROM adhering to the new standard format (~A and ~S
* as placeholders) of length N and return a string which is adapted
* to the format used by the Guile interpreter which you are running.
*
* On successive calls with similar strings but different storage, the
* same string with same storage is returned. This is necessary since
* the existence of a garbage collector in the system may cause the same
* format string to be represented with different storage at different
* calls.
*/
char *
scm_c_oldfmt (char *from, int n)
{
#ifdef HAVE_SCM_SIMPLE_FORMAT
return from;
#else
static struct { int n; char *from; char *to; } *strings;
static int size = 0;
static int n_strings = 0;
char *to;
int i;
for (i = 0; i < n_strings; ++i)
if (n == strings[i].n && strncmp (from, strings[i].from, n) == 0)
return strings[i].to;
if (n_strings == size)
{
if (size == 0)
{
size = 10;
strings = scm_must_malloc (size * sizeof (*strings), s_oldfmt);
}
else
{
int oldsize = size;
size = 3 * oldsize / 2;
strings = scm_must_realloc (strings,
oldsize * sizeof (*strings),
size * sizeof (*strings),
s_oldfmt);
}
}
strings[n_strings].n = n;
strings[n_strings].from = strncpy (scm_must_malloc (n, s_oldfmt), from, n);
to = strings[n_strings].to = scm_must_malloc (n + 1, s_oldfmt);
n_strings++;
for (i = 0; i < n; ++i)
{
if (from[i] == '~' && ++i < n)
{
if (from[i] == 'A')
{
to[i - 1] = '%';
to[i] = 's';
}
else if (from[i] == 'S')
{
to[i - 1] = '%';
to[i] = 'S';
}
else
{
to[i - 1] = '~';
to[i] = from[i];
}
continue;
}
to[i] = from[i];
}
to[i] = '\0';
return to;
#endif
}
char *
scm_c_oldfmt0 (char *s)
{
#ifdef HAVE_SCM_SIMPLE_FORMAT
return s;
#else
return scm_c_oldfmt (s, strlen (s));
#endif
}
SCM_PROC (s_oldfmt, "oldfmt", 1, 0, 0, scm_oldfmt);
SCM
scm_oldfmt (SCM s)
{
#ifdef HAVE_SCM_SIMPLE_FORMAT
return s;
#else
int n;
SCM_ASSERT (SCM_NIMP (s) && SCM_STRINGP (s), s, 1, s_oldfmt);
n = SCM_LENGTH (s);
return scm_return_first (scm_mem2string (scm_c_oldfmt (SCM_ROCHARS (s), n),
n),
s);
#endif
}
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