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
|
#include <ctype.h>
#include <inttypes.h>
#include <limits.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "_stdio.h"
#include "_safety.h"
#pragma GCC diagnostic ignored "-Wint-conversion"
#pragma GCC diagnostic ignored "-Wtype-limits"
#define ASSIGN(__t, __arg_list, __val, __min, __max) do { \
if ((__min != 0 && (__val) < (__min)) || (__val) > (__max)) { \
UNDEFINED("Assignment to %s would overflow", #__t); \
} \
__t *__ptr = va_arg(__arg_list, __t *); \
if (__ptr == NULL) { \
UNDEFINED("Passed NULL for input conversion"); \
} \
*__ptr = (__t)(__val); \
} while (0)
static int __unget(struct io_options *opt, int c)
{
if (opt->stream) {
return ungetc(c, opt->stream);
}
opt->pos--;
return c;
}
static int __get(struct io_options *opt)
{
if (opt->stream) {
return fgetc(opt->stream);
}
return opt->string[opt->pos++];
}
GCC_SSE_HACK
static uintmax_t __get_uint(struct io_options *opt, char basec)
{
char buf[BUFSIZ] = {0};
size_t pos = 0;
int base = 10;
char *end = NULL;
if (basec == 'o') {
base = 8;
} else if (basec == 'x' || basec == 'X') {
base = 16;
}
if (opt->string) {
uintmax_t ret = strtoumax(opt->string + opt->pos, &end, base);
opt->pos += (size_t)(end - (opt->string + opt->pos));
return ret;
}
/* TODO: skip whitespace */
while (1) {
int c = __get(opt);
if (c == EOF) {
buf[pos] = '\0';
break;
}
buf[pos++] = c;
end = NULL;
strtoumax(buf, &end, base);
if (end && *end) {
break;
}
}
end = NULL;
uintmax_t ret = strtoumax(buf, &end, base);
__unget(opt, *end);
return ret;
}
GCC_SSE_HACK
static intmax_t __get_int(struct io_options *opt, char basec)
{
char buf[BUFSIZ] = {0};
size_t pos = 0;
int base = 0;
char *end = NULL;
if (basec == 'd') {
base = 10;
}
if (opt->string) {
intmax_t ret = strtoimax(opt->string + opt->pos, &end, base);
opt->pos += (size_t)(end - (opt->string + opt->pos));
return ret;
}
/* TODO: skip whitespace */
while (1) {
int c = __get(opt);
if (c == EOF) {
buf[pos] = '\0';
break;
}
buf[pos++] = c;
strtoimax(buf, &end, base);
if (end && *end) {
break;
}
}
intmax_t ret = strtoimax(buf, &end, base);
__unget(opt, *end);
return ret;
}
int __scanf(struct io_options *opt, const char * format, va_list arg)
{
int ret = 0;
SIGNAL_SAFE(0);
if (opt->string) {
opt->pos = 0;
}
while (*format) {
struct io_conversion conv = { .dir = IO_IN };
if (isspace(*format)) {
int c = 0;
while (isspace(*format)) {
format++;
}
while ((c = __get(opt)) != EOF) {
if (!isspace(c)) {
__unget(opt, c);
break;
}
}
format++;
continue;
}
if (*format != '%') {
int c = __get(opt);
if (c == *format) {
format++;
continue;
}
__unget(opt, c);
break;
}
format += __conv(format, &conv);
switch (conv.spec) {
case 'd': /* base 10 int */
case 'i': /* unknown base int */
intmax_t i = __get_int(opt, conv.spec);
switch (conv.length) {
case L_hh: ASSIGN(signed char, arg, i, SCHAR_MIN, SCHAR_MAX); break;
case L_h: ASSIGN(short int, arg, i, SHRT_MIN, SHRT_MAX); break;
case L_l: ASSIGN(long int, arg, i, LONG_MIN, LONG_MAX); break;
case L_ll: ASSIGN(long long int, arg, i, LLONG_MIN, LLONG_MAX); break;
case L_j: ASSIGN(intmax_t, arg, i, INTMAX_MIN, INTMAX_MAX); break;
//case L_z: ASSIGN(signed size_t, arg, i, 0, 0); break; /* TODO!!! */
//case L_t: ASSIGN(signed ptrdiff_t, arg, i, 0, 0); break; /* TODO!!! */
default: ASSIGN(int, arg, i, INT_MIN, INT_MAX); break;
/* case L_L: UNDEFINED(""); break; */
}
break;
case 'o': /* base 8 unsigned */
case 'u': /* base 10 unsigned */
case 'x': /* base 16 unsigned */
case 'X': /* base 16 unsigned */
uintmax_t u = __get_uint(opt, conv.spec);
switch (conv.length) {
case L_hh: ASSIGN(unsigned char, arg, u, 0, UCHAR_MAX); break;
case L_h: ASSIGN(unsigned short int, arg, u, 0, USHRT_MAX); break;
case L_l: ASSIGN(unsigned long int, arg, u, 0, ULONG_MAX); break;
case L_ll: ASSIGN(unsigned long long int, arg, u, 0, ULLONG_MAX); break;
case L_j: ASSIGN(uintmax_t, arg, u, 0, UINTMAX_MAX); break;
case L_z: ASSIGN(size_t, arg, u, 0, SIZE_MAX); break;
case L_t: ASSIGN(ptrdiff_t, arg, u, 0, PTRDIFF_MAX); break;
default: ASSIGN(unsigned int, arg, u, 0, UINT_MAX); break;
/* case L_L: UNDEFINED(""); break; */
}
break;
case 'a':
case 'A':
case 'e':
case 'E':
case 'f':
case 'F':
case 'g':
case 'G':
if (conv.length == L_L) {
/*
long double *ld = va_arg(arg, long double *);
*ld = strtold(opt->string, NULL);
*/
} else {
/*
double *d = va_arg(arg, double *);
*d = strtod(opt->string, NULL);
*/
}
break;
case 'c':
/* width (default 1) characters */
if (conv.has_width == 0) {
conv.width = 1;
}
break;
case 's':
if (conv.length != L_default && conv.length != L_l) {
//__bad_length(length, 's');
}
char *str = va_arg(arg, char *);
/* TODO: only use widht if conv.has_width == 1 */
for (uintmax_t i = 0; i < conv.width; i++) {
int c = __get(opt);
if (isspace(c)) {
__unget(opt, c);
break;
}
if ((conv.flags & F_STAR) != F_STAR) {
str[i] = c;
}
}
break;
case '[':
/* scanset */
case 'p':
/* previous printf("%p"); */
case 'n':
/* output a number */
case '%':
/* match % literal */
break;
default:
UNDEFINED("Unknown conversion specifier '%c'", *format);
break;
}
format++;
}
(void)arg;
return ret;
}
/*
STDC(0)
*/
|
