printf.c 7.34 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
#include <stdint.h>
#include <string.h>
#include <stdarg.h>

#include "std.h"
#include "misc.h"
#include "systick.h"
#include "mpconfig.h"
#include "qstr.h"
#include "obj.h"
Dave Hylands's avatar
Dave Hylands committed
11
#include "pfenv.h"
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
#if 0
#include "lcd.h"
#endif
#include "usart.h"
#include "usb.h"

#if MICROPY_ENABLE_FLOAT
#include "formatfloat.h"
#endif

void pfenv_prints(const pfenv_t *pfenv, const char *str) {
    pfenv->print_strn(pfenv->data, str, strlen(str));
}

int pfenv_printf(const pfenv_t *pfenv, const char *fmt, va_list args) {
    int chrs = 0;
    for (;;) {
        {
            const char *f = fmt;
            while (*f != '\0' && *f != '%') {
                ++f; // XXX UTF8 advance char
            }
            if (f > fmt) {
                pfenv->print_strn(pfenv->data, fmt, f - fmt);
                chrs += f - fmt;
                fmt = f;
            }
        }

        if (*fmt == '\0') {
            break;
        }

        // move past % character
        ++fmt;

        // parse flags, if they exist
        int flags = 0;
Dave Hylands's avatar
Dave Hylands committed
50
        char fill = ' ';
51
52
53
54
55
        while (*fmt != '\0') {
            if (*fmt == '-') flags |= PF_FLAG_LEFT_ADJUST;
            else if (*fmt == '+') flags |= PF_FLAG_SHOW_SIGN;
            else if (*fmt == ' ') flags |= PF_FLAG_SPACE_SIGN;
            else if (*fmt == '!') flags |= PF_FLAG_NO_TRAILZ;
Dave Hylands's avatar
Dave Hylands committed
56
57
58
59
            else if (*fmt == '0') {
                flags |= PF_FLAG_PAD_AFTER_SIGN;
                fill = '0';
            } else break;
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
            ++fmt;
        }

        // parse width, if it exists
        int width = 0;
        for (; '0' <= *fmt && *fmt <= '9'; ++fmt) {
            width = width * 10 + *fmt - '0';
        }

        // parse precision, if it exists
        int prec = -1;
        if (*fmt == '.') {
            ++fmt;
            if (*fmt == '*') {
                ++fmt;
                prec = va_arg(args, int);
            } else {
                prec = 0;
                for (; '0' <= *fmt && *fmt <= '9'; ++fmt) {
                    prec = prec * 10 + *fmt - '0';
                }
            }
            if (prec < 0) {
                prec = 0;
            }
        }

        // parse long specifiers (current not used)
        //bool long_arg = false;
        if (*fmt == 'l') {
            ++fmt;
            //long_arg = true;
        }

        if (*fmt == '\0') {
            break;
        }

        switch (*fmt) {
            case 'b':
                if (va_arg(args, int)) {
Dave Hylands's avatar
Dave Hylands committed
101
                    chrs += pfenv_print_strn(pfenv, "true", 4, flags, fill, width);
102
                } else {
Dave Hylands's avatar
Dave Hylands committed
103
                    chrs += pfenv_print_strn(pfenv, "false", 5, flags, fill, width);
104
105
106
107
108
                }
                break;
            case 'c':
            {
                char str = va_arg(args, int);
Dave Hylands's avatar
Dave Hylands committed
109
                chrs += pfenv_print_strn(pfenv, &str, 1, flags, fill, width);
110
111
112
113
114
115
116
117
118
                break;
            }
            case 's':
            {
                const char *str = va_arg(args, const char*);
                if (str) {
                    if (prec < 0) {
                        prec = strlen(str);
                    }
Dave Hylands's avatar
Dave Hylands committed
119
                    chrs += pfenv_print_strn(pfenv, str, prec, flags, fill, width);
120
                } else {
Dave Hylands's avatar
Dave Hylands committed
121
                    chrs += pfenv_print_strn(pfenv, "(null)", 6, flags, fill, width);
122
123
124
125
                }
                break;
            }
            case 'u':
Dave Hylands's avatar
Dave Hylands committed
126
                chrs += pfenv_print_int(pfenv, va_arg(args, int), 0, 10, 'a', flags, fill, width);
127
128
                break;
            case 'd':
Dave Hylands's avatar
Dave Hylands committed
129
                chrs += pfenv_print_int(pfenv, va_arg(args, int), 1, 10, 'a', flags, fill, width);
130
131
132
                break;
            case 'x':
            case 'p': // ?
Dave Hylands's avatar
Dave Hylands committed
133
                chrs += pfenv_print_int(pfenv, va_arg(args, int), 0, 16, 'a', flags, fill, width);
134
135
136
                break;
            case 'X':
            case 'P': // ?
Dave Hylands's avatar
Dave Hylands committed
137
                chrs += pfenv_print_int(pfenv, va_arg(args, int), 0, 16, 'A', flags, fill, width);
138
139
140
141
142
143
144
145
146
                break;
#if MICROPY_ENABLE_FLOAT
            case 'e':
            case 'E':
            case 'f':
            case 'F':
            case 'g':
            case 'G':
            {
Dave Hylands's avatar
Dave Hylands committed
147
148
149
150
151
152
153
154
155
156
157
158
#if MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_FLOAT
                mp_float_t f = va_arg(args, double);
                chrs += pfenv_print_float(pfenv, f, *fmt, flags, fill, width, prec);
#elif MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_DOUBLE
                // Currently pfenv_print_float uses snprintf, so if you want
                // to use pfenv_print_float with doubles then you'll need
                // fix it to not use snprintf first. Otherwise you'll have
                // inifinite recursion.
#error Calling pfenv_print_float with double not supported from within printf
#else
#error Unknown MICROPY FLOAT IMPL
#endif
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
                break;
            }
#endif
            default:
                pfenv->print_strn(pfenv->data, fmt, 1);
                chrs += 1;
                break;
        }
        ++fmt;
    }
    return chrs;
}

void stdout_print_strn(void *data, const char *str, unsigned int len) {
    // send stdout to USART, USB CDC VCP, and LCD if nothing else
    bool any = false;

    if (pyb_usart_global_debug != PYB_USART_NONE) {
        usart_tx_strn_cooked(pyb_usart_global_debug, str, len);
        any = true;
    }
    if (usb_vcp_is_enabled()) {
        usb_vcp_send_strn_cooked(str, len);
        any = true;
    }
    if (!any) {
#if 0
#if MICROPY_HW_HAS_LCD
        lcd_print_strn(str, len);
#endif
#endif
    }
}

static const pfenv_t pfenv_stdout = {0, stdout_print_strn};

int printf(const char *fmt, ...) {
    va_list ap;
    va_start(ap, fmt);
    int ret = pfenv_printf(&pfenv_stdout, fmt, ap);
    va_end(ap);
    return ret;
}

int vprintf(const char *fmt, va_list ap) {
    return pfenv_printf(&pfenv_stdout, fmt, ap);
}

#if MICROPY_DEBUG_PRINTERS
int DEBUG_printf(const char *fmt, ...) {
    (void)stream;
    va_list ap;
    va_start(ap, fmt);
    int ret = pfenv_printf(&pfenv_stdout, fmt, ap);
    va_end(ap);
    return ret;
}
#endif

// need this because gcc optimises printf("%c", c) -> putchar(c), and printf("a") -> putchar('a')
int putchar(int c) {
    char chr = c;
    stdout_print_strn(0, &chr, 1);
    return chr;
}

// need this because gcc optimises printf("string\n") -> puts("string")
int puts(const char *s) {
    stdout_print_strn(0, s, strlen(s));
    char chr = '\n';
    stdout_print_strn(0, &chr, 1);
    return 1;
}

typedef struct _strn_pfenv_t {
    char *cur;
    size_t remain;
} strn_pfenv_t;

void strn_print_strn(void *data, const char *str, unsigned int len) {
    strn_pfenv_t *strn_pfenv = data;
    if (len > strn_pfenv->remain) {
        len = strn_pfenv->remain;
    }
    memcpy(strn_pfenv->cur, str, len);
    strn_pfenv->cur += len;
    strn_pfenv->remain -= len;
}
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
int vsnprintf(char *str, size_t size, const char *fmt, va_list ap) {
    strn_pfenv_t strn_pfenv;
    strn_pfenv.cur = str;
    strn_pfenv.remain = size;
    pfenv_t pfenv;
    pfenv.data = &strn_pfenv;
    pfenv.print_strn = strn_print_strn;
    int len = pfenv_printf(&pfenv, fmt, ap);
    // add terminating null byte
    if (size > 0) {
        if (strn_pfenv.remain == 0) {
            strn_pfenv.cur[-1] = 0;
        } else {
            strn_pfenv.cur[0] = 0;
        }
    }
    return len;
}

int snprintf(char *str, size_t size, const char *fmt, ...) {
    va_list ap;
    va_start(ap, fmt);
    int ret = vsnprintf(str, size, fmt, ap);
    va_end(ap);
    return ret;
}