/* * Copyright (c) 1989 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint char copyright[] = "@(#) Copyright (c) 1989 The Regents of the University of California.\n\ All rights reserved.\n"; #endif /* not lint */ #ifndef lint /*static char sccsid[] = "from: @(#)printf.c 5.9 (Berkeley) 6/1/90";*/ static char rcsid[] = "$Id: printf.c,v 1.4 1993/11/05 20:12:40 jtc Exp $"; #endif /* not lint */ #include #include #include #include #include #include #include void do_printf(); void print_escape_str(); int print_escape(); int getchr(); int getint(); long getlong(); double getdouble(); char *getstr(); int rval; char **gargv; #define isodigit(c) ((c) >= '0' && (c) <= '7') #define octtobin(c) ((c) - '0') #define hextobin(c) ((c) >= 'A' && 'c' <= 'F' ? c - 'A' + 10 : (c) >= 'a' && (c) <= 'f' ? c - 'a' + 10 : c - '0') #define PF(f, func) { \ if (fieldwidth) \ if (precision) \ (void)printf(f, fieldwidth, precision, func); \ else \ (void)printf(f, fieldwidth, func); \ else if (precision) \ (void)printf(f, precision, func); \ else \ (void)printf(f, func); \ } int main(argc, argv) int argc; char **argv; { char *format; setlocale (LC_ALL, ""); if (argc < 2) { fprintf(stderr, "usage: printf format [arg ...]\n"); exit(1); } format = argv[1]; gargv = argv + 2; do { do_printf(format); } while (*gargv); exit (rval); } void do_printf(format) char *format; { static char *skip1, *skip2; register char *fmt, *start; register int fieldwidth, precision; char convch, nextch, *mklong(); /* * Basic algorithm is to scan the format string for conversion * specifications -- once one is found, find out if the field * width or precision is a '*'; if it is, gather up value. Note, * format strings are reused as necessary to use up the provided * arguments, arguments of zero/null string are provided to use * up the format string. */ skip1 = "#-+ 0"; skip2 = "*0123456789"; /* find next format specification */ for (fmt = format; *fmt; fmt++) { switch (*fmt) { case '%': start = fmt++; if (*fmt == '%') { putchar ('%'); break; } else if (*fmt == 'b') { char *p = getstr(); print_escape_str(p); break; } /* skip to field width */ for (; index(skip1, *fmt); ++fmt); fieldwidth = *fmt == '*' ? getint() : 0; /* skip to possible '.', get following precision */ for (; index(skip2, *fmt); ++fmt); if (*fmt == '.') ++fmt; precision = *fmt == '*' ? getint() : 0; for (; index(skip2, *fmt); ++fmt); if (!*fmt) { warnx ("missing format character"); rval = 1; return; } convch = *fmt; nextch = *(fmt + 1); *(fmt + 1) = '\0'; switch(convch) { case 'c': { char p = getchr(); PF(start, p); break; } case 's': { char *p = getstr(); PF(start, p); break; } case 'd': case 'i': case 'o': case 'u': case 'x': case 'X': { char *f = mklong(start, convch); long p = getlong(); PF(f, p); free(f); break; } case 'e': case 'E': case 'f': case 'g': case 'G': { double p = getdouble(); PF(start, p); break; } default: warnx ("%s: invalid directive", start); rval = 1; } *(fmt + 1) = nextch; break; case '\\': fmt += print_escape(fmt); break; default: putchar (*fmt); break; } } } /* * Print SysV echo(1) style escape string */ void print_escape_str(str) register char *str; { int value; int c; while (*str) { if (*str == '\\') { str++; /* * %b string octal constants are not like those in C. * They start with a \0, and are followed by 0, 1, 2, * or 3 octal digits. */ if (*str == '0') { str++; for (c = 3, value = 0; c-- && isodigit(*str); str++) { value <<= 3; value += octtobin(*str); } putchar (value); str--; } else if (*str == 'c') { exit (rval); } else { str--; str += print_escape(str); } } else { putchar (*str); } str++; } } /* * Print "standard" escape characters */ int print_escape(str) register char *str; { char *start = str; int c; int value; str++; switch (*str) { case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': for (c = 3, value = 0; c-- && isodigit(*str); str++) { value <<= 3; value += octtobin(*str); } putchar(value); return str - start - 1; /* NOTREACHED */ case 'x': str++; for (value = 0; isxdigit(*str); str++) { value <<= 4; value += hextobin(*str); } if (value > UCHAR_MAX) { warnx ("escape sequence out of range for character"); rval = 1; } putchar (value); return str - start - 1; /* NOTREACHED */ case '\\': /* backslash */ putchar('\\'); break; case '\'': /* single quote */ putchar('\''); break; case '"': /* double quote */ putchar('"'); break; case 'a': /* alert */ #ifdef __STDC__ putchar('\a'); #else putchar(007); #endif break; case 'b': /* backspace */ putchar('\b'); break; case 'e': /* escape */ #ifdef __GNUC__ putchar('\e'); #else putchar(033); #endif break; case 'f': /* form-feed */ putchar('\f'); break; case 'n': /* newline */ putchar('\n'); break; case 'r': /* carriage-return */ putchar('\r'); break; case 't': /* tab */ putchar('\t'); break; case 'v': /* vertical-tab */ putchar('\v'); break; default: putchar(*str); warnx("unknown escape sequence `\\%c'", *str); rval = 1; } return 1; } char * mklong(str, ch) char *str, ch; { int len; char *copy; len = strlen(str) + 2; if (!(copy = malloc((unsigned int)len))) { err(1, NULL); /* NOTREACHED */ } bcopy(str, copy, len - 3); copy[len - 3] = 'l'; copy[len - 2] = ch; copy[len - 1] = '\0'; return(copy); } int getchr() { if (!*gargv) return((int)'\0'); return((int)**gargv++); } char * getstr() { if (!*gargv) return(""); return(*gargv++); } static char *number = "+-.0123456789"; int getint() { if (!*gargv) return(0); if (index(number, **gargv)) return(atoi(*gargv++)); return 0; } long getlong() { long val; char *ep; if (!*gargv) return(0L); if (**gargv == '\"' || **gargv == '\'') { val = gargv[0][1]; gargv++; return val; } val = strtol (*gargv, &ep, 0); if (*ep) { warnx ("incompletely converted argument: %s", *gargv); rval = 1; } gargv++; return val; } double getdouble() { double val; char *ep; if (!*gargv) return(0.0); if (**gargv == '\"' || **gargv == '\'') { val = gargv[0][1]; gargv++; return val; } val = strtod (*gargv, &ep); if (*ep) { warnx ("incompletely converted argument: %s", *gargv); rval = 1; } gargv++; return val; }