/* * ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd). * sprintf_irc.c: Functions for printing to a string. * * Copyright (C) 2002 by the past and present ircd coders, and others. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 * USA * * $Id$ */ #include "stdinc.h" #include "sprintf_irc.h" #include "irc_string.h" static const char atoi_tab[4000] = { '0','0','0',0, '0','0','1',0, '0','0','2',0, '0','0','3',0, '0','0','4',0, '0','0','5',0, '0','0','6',0, '0','0','7',0, '0','0','8',0, '0','0','9',0, '0','1','0',0, '0','1','1',0, '0','1','2',0, '0','1','3',0, '0','1','4',0, '0','1','5',0, '0','1','6',0, '0','1','7',0, '0','1','8',0, '0','1','9',0, '0','2','0',0, '0','2','1',0, '0','2','2',0, '0','2','3',0, '0','2','4',0, '0','2','5',0, '0','2','6',0, '0','2','7',0, '0','2','8',0, '0','2','9',0, '0','3','0',0, '0','3','1',0, '0','3','2',0, '0','3','3',0, '0','3','4',0, '0','3','5',0, '0','3','6',0, '0','3','7',0, '0','3','8',0, '0','3','9',0, '0','4','0',0, 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'9','6','5',0, '9','6','6',0, '9','6','7',0, '9','6','8',0, '9','6','9',0, '9','7','0',0, '9','7','1',0, '9','7','2',0, '9','7','3',0, '9','7','4',0, '9','7','5',0, '9','7','6',0, '9','7','7',0, '9','7','8',0, '9','7','9',0, '9','8','0',0, '9','8','1',0, '9','8','2',0, '9','8','3',0, '9','8','4',0, '9','8','5',0, '9','8','6',0, '9','8','7',0, '9','8','8',0, '9','8','9',0, '9','9','0',0, '9','9','1',0, '9','9','2',0, '9','9','3',0, '9','9','4',0, '9','9','5',0, '9','9','6',0, '9','9','7',0, '9','9','8',0, '9','9','9',0 }; static char scratch_buffer[32]; /* * sprintf_irc * * sprintf_irc is optimized for the formats: %c, %s, %lu, %d and %u. * Where %lu actually equals %l09u (for printing time_t timestamps). * * sprintf_irc is NOT optimized for any other format and resorts to using * the normal sprintf when it encounters a format it doesn't understand * (including padding, width, precision etc). * * The following benchmark was measured on a PPro200 with linux 2.0.30, * libc 5.4.28, compiled with gcc-2.7.2.1 with -O3. * * Format sprintf sprintf_irc Speed up factor * * "12345678901234567890" 3.385 us 0.859 us 3.94 * "%s", buffer (20 chars) 3.780 us 0.547 us 6.91 * "%c%c%c", c1, c2, c3 3.640 us 0.376 us 9.68 * "%lu", (time_t)t 5.851 us 0.842 us 6.95 * * Less important: * "%d", 31337 4.487 us 0.852 us 5.27 * "%u.%u.%u.%u", 9.069 us 2.431 us 3.73 * * Not used: * "%03d", 401 4.348 us * "%N" 0.216 us 20.13 * * --Run */ int vsprintf_irc(char *str, const char *format, va_list args) { char c; int bytes = 0; while ((c = *format++)) { if (c == '%') { c = *format++; /* May never be '\0' ! */ if (c == 's') { const char *p1 = va_arg(args, const char *); if ((*str = *p1)) { ++bytes; while ((*++str = *++p1)) ++bytes; } continue; } if (c == 'c') { *str++ = (char) va_arg(args, int); ++bytes; continue; } /* * Prints time_t value in interval * [ 100000000 , 4294967295 ] * Actually prints like "%09lu" */ if (c == 'l' && *format == 'u') { unsigned long v1, v2; const char *ap; ++format; v1 = va_arg(args, unsigned long); if (v1 == 0) { *str++ = '0'; ++bytes; continue; } if (v1 > 999999999L) { v2 = v1 / 1000000000; v1 -= v2 * 1000000000; *str++ = '0' + v2; ++bytes; } v2 = v1 / 1000000; v1 -= v2 * 1000000; ap = atoi_tab + (v2 << 2); *str++ = *ap++; *str++ = *ap++; *str++ = *ap; v2 = v1 / 1000; v1 -= v2 * 1000; ap = atoi_tab + (v2 << 2); *str++ = *ap++; *str++ = *ap++; *str++ = *ap; ap = atoi_tab + (v1 << 2); *str++ = *ap++; *str++ = *ap++; *str++ = *ap; bytes += 9; continue; } if (c == 't') { unsigned int v1; v1 = va_arg(args,int); *str++ = (v1/10) + '0'; *str++ = v1%10 + '0'; bytes += 2; continue; } if (c == 'd') { unsigned int v1, v2; const char *ap; char *s = &scratch_buffer[sizeof(scratch_buffer) - 2]; v1 = va_arg(args, int); if ((int)v1 <= 0) { if (v1 == 0) { *str++ = '0'; ++bytes; continue; } *str++ = '-'; ++bytes; v1 = -v1; } do { v2 = v1 / 1000; ap = atoi_tab + 2 + ((v1 - 1000 * v2) << 2); *s-- = *ap--; *s-- = *ap--; *s-- = *ap; } while ((v1 = v2) > 0); while ('0' == *++s); *str = *s; ++bytes; while ((*++str = *++s)) ++bytes; continue; } if (c == 'u') { unsigned int v1, v2; const char *ap; char *s = &scratch_buffer[sizeof(scratch_buffer) - 2]; v1 = va_arg(args, unsigned int); if (v1 == 0) { *str++ = '0'; ++bytes; continue; } do { v2 = v1 / 1000; ap = atoi_tab + 2 + ((v1 - 1000 * v2) << 2); *s-- = *ap--; *s-- = *ap--; *s-- = *ap; } while ((v1 = v2) > 0); while ('0' == *++s); *str = *s; ++bytes; while ((*++str = *++s)) ++bytes; continue; } if (c != '%') { int ret; format -= 2; ret = vsprintf(str, format, args); str += ret; bytes += ret; break; } } *str++ = c; ++bytes; } *str = '\0'; return(bytes); } /* vsprintf_irc() */ int ircsprintf(char *str, const char *format, ...) { va_list args; int bytes; va_start(args, format); bytes = vsprintf_irc(str, format, args); va_end(args); return(bytes); } /* ircsprintf() */