Mercurial > lcfOS
view cos/kernel/snprintf.c @ 9:92ace1ca50a8
64 bits kernel without interrupts but with printf in C
author | windel |
---|---|
date | Sun, 13 Nov 2011 12:47:47 +0100 |
parents | |
children | fcdae30b2782 |
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/* * snprintf.c */ #include "kernel.h" #include "stdarg.h" #include "ctype.h" unsigned char _ctype[] = { _C,_C,_C,_C,_C,_C,_C,_C, /* 0-7 */ _C,_C|_S,_C|_S,_C|_S,_C|_S,_C|_S,_C,_C, /* 8-15 */ _C,_C,_C,_C,_C,_C,_C,_C, /* 16-23 */ _C,_C,_C,_C,_C,_C,_C,_C, /* 24-31 */ _S|_SP,_P,_P,_P,_P,_P,_P,_P, /* 32-39 */ _P,_P,_P,_P,_P,_P,_P,_P, /* 40-47 */ _D,_D,_D,_D,_D,_D,_D,_D, /* 48-55 */ _D,_D,_P,_P,_P,_P,_P,_P, /* 56-63 */ _P,_U|_X,_U|_X,_U|_X,_U|_X,_U|_X,_U|_X,_U, /* 64-71 */ _U,_U,_U,_U,_U,_U,_U,_U, /* 72-79 */ _U,_U,_U,_U,_U,_U,_U,_U, /* 80-87 */ _U,_U,_U,_P,_P,_P,_P,_P, /* 88-95 */ _P,_L|_X,_L|_X,_L|_X,_L|_X,_L|_X,_L|_X,_L, /* 96-103 */ _L,_L,_L,_L,_L,_L,_L,_L, /* 104-111 */ _L,_L,_L,_L,_L,_L,_L,_L, /* 112-119 */ _L,_L,_L,_P,_P,_P,_P,_C, /* 120-127 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 128-143 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 144-159 */ _S|_SP,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P, /* 160-175 */ _P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P, /* 176-191 */ _U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U, /* 192-207 */ _U,_U,_U,_U,_U,_U,_U,_P,_U,_U,_U,_U,_U,_U,_U,_L, /* 208-223 */ _L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L, /* 224-239 */ _L,_L,_L,_L,_L,_L,_L,_P,_L,_L,_L,_L,_L,_L,_L,_L}; /* 240-255 */ #define MORE_THAN_YOU_WANT 1<<30 #define MAX_STDOUT_CHARS 255 static char hexmap[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; void va_snprintf(char *b, int l, const char *fmt, va_list pvar) { int n, i; uint_t u; ulonglong_t ull; char *t; char d[10]; char mod_l; char mod_ll; if (!fmt || !b || (l < 1)) return; mod_l = 0; mod_ll = 0; while (l && *fmt) { if (*fmt == '%') { if (!(--l)) break; again: fmt++; switch (*fmt) { case '.': /* precision modifier */ while(isdigit(fmt[1])) fmt++; goto again; case 'l': /* long modifier */ if (!mod_l) { mod_l = 1; } else if (!mod_ll) { mod_l = 0; mod_ll = 1; } goto again; case 's': /* string */ t = va_arg(pvar, char *); while (l && *t) *b++ = *t++, l--; break; case 'c': /* single character */ *b++ = va_arg(pvar, char); l--; break; case 'S': /* uint32 as a short ... */ if (l < 4) { l = 0; break; } u = va_arg(pvar, unsigned int); for (i = 3; i >= 0; i--) { b[i] = hexmap[u & 0x0F]; u >>= 4; } b += 4; l -= 4; break; case 'x': case 'p': if (!mod_ll) { /* 8 digit, unsigned 32-bit hex integer */ if (l < 8) { l = 0; break; } u = va_arg(pvar, unsigned int); for (i = 7; i >= 0; i--) { b[i] = hexmap[u & 0x0F]; u >>= 4; } b += 8; l -= 8; } else if (mod_ll) { /* 16 digit, unsigned 64-bit hex integer */ if (l < 16) { l = 0; break; } ull = va_arg(pvar, unsigned long long); for (i = 15; i >= 0; i--) { b[i] = hexmap[ull & 0x0f]; ull >>= 4; } b += 16; l -= 16; } mod_l = mod_ll = 0; break; case 'd': /* signed integer */ n = va_arg(pvar, int); if (n < 0) { u = -n; *b++ = '-'; if (!(--l)) break; } else { u = n; } goto u2; case 'u': /* unsigned integer */ u = va_arg(pvar, unsigned int); u2: i = 9; do { d[i] = (u % 10) + '0'; u /= 10; i--; } while (u && i >= 0); while (++i < 10) { *b++ = d[i]; if (!(--l)) break; } break; case 'U': u = va_arg(pvar, unsigned int); i = 9; d[8] = d[7] = d[6] = ' '; do { d[i] = (u % 10) + '0'; u /= 10; i--; } while (u && i >= 0); i = 5; while (++i < 10) { *b++ = d[i]; if (!(--l)) break; } break; case 'X': /* 2 digit, unsigned 8bit hex int */ if (l < 2) { l = 0; break; } n = va_arg(pvar, int); *b++ = hexmap[(n & 0xF0) >> 4]; *b++ = hexmap[n & 0x0F]; l -= 2; break; default: *b++ = *fmt; } } else { *b++ = *fmt; l--; } fmt++; } *b = 0; } void snprintf(char *str, int len, char *fmt, ...) { va_list pvar; va_start(pvar, fmt); va_snprintf(str, len, fmt, pvar); va_end(pvar); } void sprintf(char *dst, const char *fmt, ...) { va_list args; va_start(args, fmt); va_snprintf(dst, MORE_THAN_YOU_WANT, fmt, args); va_end(args); } void printf(const char* fmt, ...) { static char buf[MAX_STDOUT_CHARS]; va_list args; va_start(args, fmt); va_snprintf(buf, MAX_STDOUT_CHARS, fmt, args); va_end(args); print_string(buf); }