1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/* Copyright (C) 2000 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* The exception is that, if you link the GUILE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the GUILE library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the
* Free Software Foundation under the name GUILE. If you copy
* code from other Free Software Foundation releases into a copy of
* GUILE, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice.
*/
/* 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_makfromstr (scm_c_oldfmt (SCM_ROCHARS (s), n),
n,
0),
s);
#endif
}
|