xref: /rk3399_rockchip-uboot/lib/tiny-printf.c (revision a28e1d98310e62dc88947b91d17105b58de01889)
1 /*
2  * Tiny printf version for SPL
3  *
4  * Copied from:
5  * http://www.sparetimelabs.com/printfrevisited/printfrevisited.php
6  *
7  * Copyright (C) 2004,2008  Kustaa Nyholm
8  *
9  * SPDX-License-Identifier:	LGPL-2.1+
10  */
11 
12 #include <common.h>
13 #include <stdarg.h>
14 #include <serial.h>
15 
16 struct printf_info {
17 	char *bf;	/* Digit buffer */
18 	char zs;	/* non-zero if a digit has been written */
19 	char *outstr;	/* Next output position for sprintf() */
20 
21 	/* Output a character */
22 	void (*putc)(struct printf_info *info, char ch);
23 };
24 
25 void putc_normal(struct printf_info *info, char ch)
26 {
27 	putc(ch);
28 }
29 
30 static void out(struct printf_info *info, char c)
31 {
32 	*info->bf++ = c;
33 }
34 
35 static void out_dgt(struct printf_info *info, char dgt)
36 {
37 	out(info, dgt + (dgt < 10 ? '0' : 'a' - 10));
38 	info->zs = 1;
39 }
40 
41 static void div_out(struct printf_info *info, unsigned long *num,
42 		    unsigned long div)
43 {
44 	unsigned char dgt = 0;
45 
46 	while (*num >= div) {
47 		*num -= div;
48 		dgt++;
49 	}
50 
51 	if (info->zs || dgt > 0)
52 		out_dgt(info, dgt);
53 }
54 
55 int _vprintf(struct printf_info *info, const char *fmt, va_list va)
56 {
57 	char ch;
58 	char *p;
59 	unsigned long num;
60 	char buf[12];
61 	unsigned long div;
62 
63 	while ((ch = *(fmt++))) {
64 		if (ch != '%') {
65 			info->putc(info, ch);
66 		} else {
67 			bool lz = false;
68 			int width = 0;
69 			bool islong = false;
70 
71 			ch = *(fmt++);
72 			if (ch == '0') {
73 				ch = *(fmt++);
74 				lz = 1;
75 			}
76 
77 			if (ch >= '0' && ch <= '9') {
78 				width = 0;
79 				while (ch >= '0' && ch <= '9') {
80 					width = (width * 10) + ch - '0';
81 					ch = *fmt++;
82 				}
83 			}
84 			if (ch == 'l') {
85 				ch = *(fmt++);
86 				islong = true;
87 			}
88 
89 			info->bf = buf;
90 			p = info->bf;
91 			info->zs = 0;
92 
93 			switch (ch) {
94 			case '\0':
95 				goto abort;
96 			case 'u':
97 			case 'd':
98 				div = 1000000000;
99 				if (islong) {
100 					num = va_arg(va, unsigned long);
101 					if (sizeof(long) > 4)
102 						div *= div * 10;
103 				} else {
104 					num = va_arg(va, unsigned int);
105 				}
106 
107 				if (ch == 'd') {
108 					if (islong && (long)num < 0) {
109 						num = -(long)num;
110 						out(info, '-');
111 					} else if (!islong && (int)num < 0) {
112 						num = -(int)num;
113 						out(info, '-');
114 					}
115 				}
116 				if (!num) {
117 					out_dgt(info, 0);
118 				} else {
119 					for (; div; div /= 10)
120 						div_out(info, &num, div);
121 				}
122 				break;
123 			case 'x':
124 				if (islong) {
125 					num = va_arg(va, unsigned long);
126 					div = 1UL << (sizeof(long) * 8 - 4);
127 				} else {
128 					num = va_arg(va, unsigned int);
129 					div = 0x10000000;
130 				}
131 				if (!num) {
132 					out_dgt(info, 0);
133 				} else {
134 					for (; div; div /= 0x10)
135 						div_out(info, &num, div);
136 				}
137 				break;
138 			case 'c':
139 				out(info, (char)(va_arg(va, int)));
140 				break;
141 			case 's':
142 				p = va_arg(va, char*);
143 				break;
144 			case '%':
145 				out(info, '%');
146 			default:
147 				break;
148 			}
149 
150 			*info->bf = 0;
151 			info->bf = p;
152 			while (*info->bf++ && width > 0)
153 				width--;
154 			while (width-- > 0)
155 				info->putc(info, lz ? '0' : ' ');
156 			if (p) {
157 				while ((ch = *p++))
158 					info->putc(info, ch);
159 			}
160 		}
161 	}
162 
163 abort:
164 	return 0;
165 }
166 
167 int vprintf(const char *fmt, va_list va)
168 {
169 	struct printf_info info;
170 
171 	info.putc = putc_normal;
172 	return _vprintf(&info, fmt, va);
173 }
174 
175 int printf(const char *fmt, ...)
176 {
177 	struct printf_info info;
178 
179 	va_list va;
180 	int ret;
181 
182 	info.putc = putc_normal;
183 	va_start(va, fmt);
184 	ret = _vprintf(&info, fmt, va);
185 	va_end(va);
186 
187 	return ret;
188 }
189 
190 static void putc_outstr(struct printf_info *info, char ch)
191 {
192 	*info->outstr++ = ch;
193 }
194 
195 int sprintf(char *buf, const char *fmt, ...)
196 {
197 	struct printf_info info;
198 	va_list va;
199 	int ret;
200 
201 	va_start(va, fmt);
202 	info.outstr = buf;
203 	info.putc = putc_outstr;
204 	ret = _vprintf(&info, fmt, va);
205 	va_end(va);
206 	*info.outstr = '\0';
207 
208 	return ret;
209 }
210 
211 /* Note that size is ignored */
212 int snprintf(char *buf, size_t size, const char *fmt, ...)
213 {
214 	struct printf_info info;
215 	va_list va;
216 	int ret;
217 
218 	va_start(va, fmt);
219 	info.outstr = buf;
220 	info.putc = putc_outstr;
221 	ret = _vprintf(&info, fmt, va);
222 	va_end(va);
223 	*info.outstr = '\0';
224 
225 	return ret;
226 }
227 
228 void __assert_fail(const char *assertion, const char *file, unsigned line,
229 		   const char *function)
230 {
231 	/* This will not return */
232 	printf("%s:%u: %s: Assertion `%s' failed.", file, line, function,
233 	       assertion);
234 	hang();
235 }
236