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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 | // SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (C) 1996-2005 Paul Mackerras. */ #include <linux/string.h> #include <asm/udbg.h> #include <asm/time.h> #include "nonstdio.h" static bool paginating, paginate_skipping; static unsigned long paginate_lpp; /* Lines Per Page */ static unsigned long paginate_pos; void xmon_start_pagination(void) { paginating = true; paginate_skipping = false; paginate_pos = 0; } void xmon_end_pagination(void) { paginating = false; } void xmon_set_pagination_lpp(unsigned long lpp) { paginate_lpp = lpp; } static int xmon_readchar(void) { if (udbg_getc) return udbg_getc(); return -1; } static int xmon_write(const char *ptr, int nb) { int rv = 0; const char *p = ptr, *q; const char msg[] = "[Hit a key (a:all, q:truncate, any:next page)]"; if (nb <= 0) return rv; if (paginating && paginate_skipping) return nb; if (paginate_lpp) { while (paginating && (q = strchr(p, '\n'))) { rv += udbg_write(p, q - p + 1); p = q + 1; paginate_pos++; if (paginate_pos >= paginate_lpp) { udbg_write(msg, strlen(msg)); switch (xmon_readchar()) { case 'a': paginating = false; break; case 'q': paginate_skipping = true; break; default: /* nothing */ break; } paginate_pos = 0; udbg_write("\r\n", 2); if (paginate_skipping) return nb; } } } return rv + udbg_write(p, nb - (p - ptr)); } int xmon_putchar(int c) { char ch = c; if (c == '\n') xmon_putchar('\r'); return xmon_write(&ch, 1) == 1? c: -1; } static char line[256]; static char *lineptr; static int lineleft; static int xmon_getchar(void) { int c; if (lineleft == 0) { lineptr = line; for (;;) { c = xmon_readchar(); if (c == -1 || c == 4) break; if (c == '\r' || c == '\n') { *lineptr++ = '\n'; xmon_putchar('\n'); break; } switch (c) { case 0177: case '\b': if (lineptr > line) { xmon_putchar('\b'); xmon_putchar(' '); xmon_putchar('\b'); --lineptr; } break; case 'U' & 0x1F: while (lineptr > line) { xmon_putchar('\b'); xmon_putchar(' '); xmon_putchar('\b'); --lineptr; } break; default: if (lineptr >= &line[sizeof(line) - 1]) xmon_putchar('\a'); else { xmon_putchar(c); *lineptr++ = c; } } } lineleft = lineptr - line; lineptr = line; } if (lineleft == 0) return -1; --lineleft; return *lineptr++; } char *xmon_gets(char *str, int nb) { char *p; int c; for (p = str; p < str + nb - 1; ) { c = xmon_getchar(); if (c == -1) { if (p == str) return NULL; break; } *p++ = c; if (c == '\n') break; } *p = 0; return str; } void xmon_printf(const char *format, ...) { va_list args; static char xmon_outbuf[1024]; int rc, n; va_start(args, format); n = vsnprintf(xmon_outbuf, sizeof(xmon_outbuf), format, args); va_end(args); rc = xmon_write(xmon_outbuf, n); if (n && rc == 0) { /* No udbg hooks, fallback to printk() - dangerous */ pr_cont("%s", xmon_outbuf); } } void xmon_puts(const char *str) { xmon_write(str, strlen(str)); } |