Stefan Roese | 7d9cde1 | 2015-11-23 07:00:22 +0100 | [diff] [blame] | 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 | static char *bf; |
Stefan Roese | 7d9cde1 | 2015-11-23 07:00:22 +0100 | [diff] [blame] | 17 | static char zs; |
| 18 | |
| 19 | static void out(char c) |
| 20 | { |
| 21 | *bf++ = c; |
| 22 | } |
| 23 | |
| 24 | static void out_dgt(char dgt) |
| 25 | { |
Stefan Roese | a5ecdd0 | 2015-11-16 15:26:34 +0100 | [diff] [blame^] | 26 | out(dgt + (dgt < 10 ? '0' : 'a' - 10)); |
Stefan Roese | 7d9cde1 | 2015-11-23 07:00:22 +0100 | [diff] [blame] | 27 | zs = 1; |
| 28 | } |
| 29 | |
Stefan Roese | a5ecdd0 | 2015-11-16 15:26:34 +0100 | [diff] [blame^] | 30 | static void div_out(unsigned int *num, unsigned int div) |
Stefan Roese | 7d9cde1 | 2015-11-23 07:00:22 +0100 | [diff] [blame] | 31 | { |
| 32 | unsigned char dgt = 0; |
| 33 | |
Stefan Roese | a5ecdd0 | 2015-11-16 15:26:34 +0100 | [diff] [blame^] | 34 | while (*num >= div) { |
| 35 | *num -= div; |
Stefan Roese | 7d9cde1 | 2015-11-23 07:00:22 +0100 | [diff] [blame] | 36 | dgt++; |
| 37 | } |
| 38 | |
| 39 | if (zs || dgt > 0) |
| 40 | out_dgt(dgt); |
| 41 | } |
| 42 | |
| 43 | int printf(const char *fmt, ...) |
| 44 | { |
| 45 | va_list va; |
| 46 | char ch; |
| 47 | char *p; |
Stefan Roese | a5ecdd0 | 2015-11-16 15:26:34 +0100 | [diff] [blame^] | 48 | unsigned int num; |
| 49 | char buf[12]; |
| 50 | unsigned int div; |
Stefan Roese | 7d9cde1 | 2015-11-23 07:00:22 +0100 | [diff] [blame] | 51 | |
| 52 | va_start(va, fmt); |
| 53 | |
| 54 | while ((ch = *(fmt++))) { |
| 55 | if (ch != '%') { |
| 56 | putc(ch); |
| 57 | } else { |
| 58 | char lz = 0; |
| 59 | char w = 0; |
| 60 | |
| 61 | ch = *(fmt++); |
| 62 | if (ch == '0') { |
| 63 | ch = *(fmt++); |
| 64 | lz = 1; |
| 65 | } |
| 66 | |
| 67 | if (ch >= '0' && ch <= '9') { |
| 68 | w = 0; |
| 69 | while (ch >= '0' && ch <= '9') { |
Stefan Roese | a5ecdd0 | 2015-11-16 15:26:34 +0100 | [diff] [blame^] | 70 | w = (w * 10) + ch - '0'; |
Stefan Roese | 7d9cde1 | 2015-11-23 07:00:22 +0100 | [diff] [blame] | 71 | ch = *fmt++; |
| 72 | } |
| 73 | } |
| 74 | bf = buf; |
| 75 | p = bf; |
| 76 | zs = 0; |
| 77 | |
| 78 | switch (ch) { |
| 79 | case 0: |
| 80 | goto abort; |
| 81 | case 'u': |
| 82 | case 'd': |
| 83 | num = va_arg(va, unsigned int); |
| 84 | if (ch == 'd' && (int)num < 0) { |
| 85 | num = -(int)num; |
| 86 | out('-'); |
| 87 | } |
Stefan Roese | a5ecdd0 | 2015-11-16 15:26:34 +0100 | [diff] [blame^] | 88 | for (div = 1000000000; div; div /= 10) |
| 89 | div_out(&num, div); |
Stefan Roese | 7d9cde1 | 2015-11-23 07:00:22 +0100 | [diff] [blame] | 90 | break; |
| 91 | case 'x': |
Stefan Roese | 7d9cde1 | 2015-11-23 07:00:22 +0100 | [diff] [blame] | 92 | num = va_arg(va, unsigned int); |
Stefan Roese | a5ecdd0 | 2015-11-16 15:26:34 +0100 | [diff] [blame^] | 93 | for (div = 0x10000000; div; div /= 0x10) |
| 94 | div_out(&num, div); |
Stefan Roese | 7d9cde1 | 2015-11-23 07:00:22 +0100 | [diff] [blame] | 95 | break; |
| 96 | case 'c': |
| 97 | out((char)(va_arg(va, int))); |
| 98 | break; |
| 99 | case 's': |
| 100 | p = va_arg(va, char*); |
| 101 | break; |
| 102 | case '%': |
| 103 | out('%'); |
| 104 | default: |
| 105 | break; |
| 106 | } |
| 107 | |
| 108 | *bf = 0; |
| 109 | bf = p; |
| 110 | while (*bf++ && w > 0) |
| 111 | w--; |
| 112 | while (w-- > 0) |
| 113 | putc(lz ? '0' : ' '); |
| 114 | while ((ch = *p++)) |
| 115 | putc(ch); |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | abort: |
| 120 | va_end(va); |
| 121 | return 0; |
| 122 | } |