-
Notifications
You must be signed in to change notification settings - Fork 0
/
form.c
342 lines (329 loc) · 12.8 KB
/
form.c
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
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
// src/aksl/form.c 2017-10-25 Alan U. Kennington.
/*-----------------------------------------------------------------------------
Copyright (C) 1989-2018, Alan U. Kennington.
You may distribute this software under the terms of Alan U. Kennington's
modified Artistic Licence, as specified in the accompanying LICENCE file.
-----------------------------------------------------------------------------*/
/*------------------------------------------------------------------------------
Functions in this file:
vform
#if EXPT_FORM_STRING
form_string
// vlform
#endif
------------------------------------------------------------------------------*/
// AKSL header files:
#include "aksl/form.h"
#ifndef AKSL_CHARBUF_H
#include "aksl/charbuf.h"
#endif
#ifndef AKSL_NUMPRINT_H
#include "aksl/numprint.h"
#endif
#ifndef AKSL_AKSLDEFS_H
#include "aksl/aksldefs.h"
#endif
// System header files:
#ifndef AKSL_X_CTYPE_H
#define AKSL_X_CTYPE_H
#include <ctype.h>
#endif
#ifndef AKSL_X_STDARG_H
#define AKSL_X_STDARG_H
#include <stdarg.h>
#endif
#ifndef AKSL_X_STDIO_H
#define AKSL_X_STDIO_H
#include <stdio.h>
#endif
/*------------------------------------------------------------------------------
This function uses vsprintf to format the string and then returns a copy which
is heap-allocated. Very large strings could fail by overflowing the buffer.
------------------------------------------------------------------------------*/
//----------------------//
// vform //
//----------------------//
#ifdef HAVE_VPRINTF
char* vform(const char* fmt, ...) {
const int bufsize = 1024;
static char buf[bufsize];
if (nullstr(fmt))
*buf = 0;
else {
va_list pvar;
va_start(pvar, fmt);
vsprintf(buf, fmt, pvar);
va_end(pvar);
}
register char* pc1 = 0;
for (pc1 = buf; *pc1; ++pc1)
;
int n = pc1 - buf; // n = strlen(buf).
char* new_string = new char[n + 1];
pc1 = buf;
register char* pc2 = new_string;
while (*pc2++ = *pc1++); // strcpy(new_string, buf).
return new_string;
} // End of function vform.
#endif /* HAVE_VPRINTF */
/*------------------------------------------------------------------------------
The returned string is allocated on the heap, and should be deleted when
finished. The returned pointer is never
null, although the null-terminated string it points to may be an empty string.
The full formatted string can be of arbitrary length.
This sort of function should have been in stdio.h. It would have been so easy to
provide it, since it is almost identical to sprintf().
------------------------------------------------------------------------------*/
//----------------------//
// form_string //
//----------------------//
#if EXPT_FORM_STRING
char* form_string(const char* format, ...) {
static c_array cbuf; // The infinite buffer for the whole string.
// const int bufsize = 1024;
// static char buf[bufsize]; // Working buffer for string components.
cbuf.reset();
if (nullstr(format))
return cbuf.copy0();
va_list pvar;
va_start(pvar, format);
const char* pc = format;
char c;
while ((c = *pc++) != 0) {
if (c == '%') { // Substitution symbol.
int fw_sign = 1;
bool_enum zero_padding = false;
int field_width = 0;
int precision = -1; // -1 means undefined here.
char size = 0; // 'h' for short, 'l' for long.
enum { // Parse state [the last field seen]:
pBEGIN, pFW_SIGN, pFW, pPREC, pSIZE, pTYPE, pEND
} pstate = pBEGIN;
while (pstate < pEND && (c = *pc++) != 0) {
switch(c) { // Interpret the printf escape codes:
case '-':
if (pstate < pFW_SIGN) {
fw_sign = -1;
pstate = pFW_SIGN;
}
break;
case '0':
if (pstate < pFW)
zero_padding = true;
// The non-break here is intentional!
case '1': case '2': case '3':
case '4': case '5': case '6':
case '7': case '8': case '9':
if (pstate < pFW) {
field_width = 0;
do {
if (!isdigit(c)) {
--pc;
break;
}
field_width *= 10;
field_width += c - '0'; // Assume ascii etc.
} while ((c = *pc++) != 0);
if (c == 0)
pstate = pEND;
else
pstate = pFW;
}
else if (pstate < pPREC) {
precision = 0;
do {
if (!isdigit(c)) {
--pc;
break;
}
precision *= 10;
precision += c - '0'; // Assume ascii etc.
} while ((c = *pc++) != 0);
if (c == 0)
pstate = pEND;
else
pstate = pPREC;
}
break;
case '.': // Separator for field width and precision.
if (pstate < pFW)
pstate = pFW;
break;
case '*': // Field width or precision is an int argument.
if (pstate < pFW) {
field_width = va_arg(pvar, int);
pstate = pFW;
}
else if (pstate < pPREC) {
precision = va_arg(pvar, int);
pstate = pPREC;
}
break;
case 'h': // Size for d, o, x, u is short.
if (pstate < pSIZE) {
size = 'h';
pstate = pSIZE;
}
break;
case 'l': // Size for d, o, x, u is long.
if (pstate < pSIZE) {
size = 'l';
pstate = pSIZE;
}
break;
case 'c': { // %c
char x = va_arg(pvar, char);
if (x) // Ignore null characters.
cbuf.append(x);
pstate = pEND;
}
break;
case 's': { // %s
const char* s = va_arg(pvar, const char*);
if (precision < 0)
precision = 0;
cbuf.append(s, precision);
pstate = pEND;
}
break;
case 'd':
case 'i':
{ // %d, %i: decimal.
long i = 0;
if (size == 'h')
i = va_arg(pvar, short int);
else if (size == 'l')
i = va_arg(pvar, long int);
else
i = va_arg(pvar, int);
field_width *= fw_sign;
if (precision < 0)
precision = 1;
cbuf.append(intstring(i, field_width, precision));
pstate = pEND;
}
break;
case 'u': { // %u: unsigned decimal.
unsigned long i = 0;
if (size == 'h')
i = va_arg(pvar, unsigned short int);
else if (size == 'l')
i = va_arg(pvar, unsigned long int);
else
i = va_arg(pvar, unsigned int);
field_width *= fw_sign;
if (precision < 0)
precision = 1;
cbuf.append(uintstring(i, field_width, precision));
pstate = pEND;
}
break;
case 'x': { // %x: hexadecimal.
long i = 0;
if (size == 'h')
i = va_arg(pvar, short int);
else if (size == 'l')
i = va_arg(pvar, long int);
else
i = va_arg(pvar, int);
field_width *= fw_sign;
if (precision < 0)
precision = 1;
cbuf.append(hexstring(i, field_width, precision));
pstate = pEND;
}
break;
case 'o': { // %o: octal.
long i = 0;
if (size == 'h')
i = va_arg(pvar, short int);
else if (size == 'l')
i = va_arg(pvar, long int);
else
i = va_arg(pvar, int);
field_width *= fw_sign;
if (precision < 0)
precision = 1;
cbuf.append(octstring(i, field_width, precision));
pstate = pEND;
}
break;
case 'p': { // %p, a pointer.
void* pv = va_arg(pvar, void*);
cbuf.append("0x");
field_width *= fw_sign;
if (precision < 0)
precision = 1;
cbuf.append(hexstring(long(pv), field_width, precision));
pstate = pEND;
}
break;
case 'f': { // %f: float.
double r = va_arg(pvar, double);
field_width *= fw_sign;
if (precision < 0)
precision = 6;
cbuf.append(f_string(r, field_width, precision));
pstate = pEND;
}
break;
case 'e': { // %e.
double r = va_arg(pvar, double);
field_width *= fw_sign;
if (precision < 0)
precision = 6;
cbuf.append(e_string(r, field_width, precision));
pstate = pEND;
}
break;
case 'g': { // %g.
double r = va_arg(pvar, double);
field_width *= fw_sign;
if (precision < 0)
precision = 6;
cbuf.append(g_string(r, field_width, precision));
pstate = pEND;
}
break;
case '%': // %%
cbuf.append(c);
pstate = pEND;
break;
case 0: // Sudden end of string.
return cbuf.copy0();
// break;
default: // Actually this should be an error!?
cbuf.append(c);
pstate = pEND;
break;
} // End of switch(c).
}
}
else { // Plain character.
cbuf.append(c);
}
}
va_end(pvar);
return cbuf.copy0();
} // End of function form_string.
/*------------------------------------------------------------------------------
This is a secure form of the old stream.h formatting function "form".
It uses a "valuelist" instead of variable numbers/types of function arguments.
This should be placed in value.c or thereabouts.
Also have functions with 2, 3, or more value arguments. Type conversion would be
used to turn int, double, etc. into arguments of dynamic type.
These sorts of functions could be implemented as a sequence of functions popping
a single from the argument list and passing on the remainder of the string and
arguments to the next function?
Note that it would be best _not_ to use class "value", but rather to create a
new class of dynamic type which has only the required argument types.
------------------------------------------------------------------------------*/
//----------------------//
// vformstring //
//----------------------//
/*------------------------------------------------------------------------------
const char* vformstring(const char* format, value* pv1) {
return 0;
} // End of function vformstring.
------------------------------------------------------------------------------*/
#endif