309 lines
6.8 KiB
C
309 lines
6.8 KiB
C
/*
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* Copyright (c) 1989 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
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All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)printf.c 5.9 (Berkeley) 6/1/90";
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#endif /* not lint */
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#include <sys/types.h>
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#include <stdio.h>
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#include <string.h>
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#define PF(f, func) { \
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if (fieldwidth) \
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if (precision) \
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(void)printf(f, fieldwidth, precision, func); \
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else \
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(void)printf(f, fieldwidth, func); \
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else if (precision) \
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(void)printf(f, precision, func); \
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else \
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(void)printf(f, func); \
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}
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char **gargv;
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main(argc, argv)
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int argc;
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char **argv;
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{
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static char *skip1, *skip2;
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register char *format, *fmt, *start;
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register int end, fieldwidth, precision;
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char convch, nextch, *getstr(), *mklong();
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double getdouble();
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long getlong();
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if (argc < 2) {
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fprintf(stderr, "usage: printf format [arg ...]\n");
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exit(1);
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}
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/*
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* Basic algorithm is to scan the format string for conversion
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* specifications -- once one is found, find out if the field
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* width or precision is a '*'; if it is, gather up value. Note,
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* format strings are reused as necessary to use up the provided
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* arguments, arguments of zero/null string are provided to use
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* up the format string.
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*/
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skip1 = "#-+ 0";
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skip2 = "*0123456789";
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escape(fmt = format = *++argv); /* backslash interpretation */
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gargv = ++argv;
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for (;;) {
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end = 0;
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/* find next format specification */
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next: for (start = fmt;; ++fmt) {
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if (!*fmt) {
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/* avoid infinite loop */
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if (end == 1) {
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fprintf(stderr,
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"printf: missing format character.\n");
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exit(1);
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}
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end = 1;
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if (fmt > start)
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(void)printf("%s", start);
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if (!*gargv)
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exit(0);
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fmt = format;
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goto next;
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}
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/* %% prints a % */
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if (*fmt == '%') {
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if (*++fmt != '%')
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break;
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*fmt++ = '\0';
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(void)printf("%s", start);
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goto next;
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}
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}
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/* skip to field width */
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for (; index(skip1, *fmt); ++fmt);
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fieldwidth = *fmt == '*' ? getint() : 0;
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/* skip to possible '.', get following precision */
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for (; index(skip2, *fmt); ++fmt);
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if (*fmt == '.')
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++fmt;
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precision = *fmt == '*' ? getint() : 0;
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/* skip to conversion char */
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for (; index(skip2, *fmt); ++fmt);
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if (!*fmt) {
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fprintf(stderr, "printf: missing format character.\n");
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exit(1);
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}
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convch = *fmt;
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nextch = *++fmt;
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*fmt = '\0';
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switch(convch) {
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case 'c': {
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char p = getchr();
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PF(start, p);
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break;
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}
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case 's': {
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char *p = getstr();
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PF(start, p);
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break;
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}
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case 'd': case 'i': case 'o': case 'u': case 'x': case 'X': {
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char *f = mklong(start, convch);
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long p = getlong();
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PF(f, p);
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break;
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}
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case 'e': case 'E': case 'f': case 'g': case 'G': {
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double p = getdouble();
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PF(start, p);
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break;
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}
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default:
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fprintf(stderr, "printf: illegal format character.\n");
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exit(1);
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}
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*fmt = nextch;
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}
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/* NOTREACHED */
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}
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char *
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mklong(str, ch)
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char *str, ch;
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{
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int len;
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char *copy, *malloc();
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len = strlen(str) + 2;
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if (!(copy = malloc((u_int)len))) { /* never freed; XXX */
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fprintf(stderr, "printf: out of memory.\n");
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exit(1);
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}
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bcopy(str, copy, len - 3);
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copy[len - 3] = 'l';
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copy[len - 2] = ch;
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copy[len - 1] = '\0';
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return(copy);
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}
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escape(fmt)
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register char *fmt;
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{
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register char *store;
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register int value, c;
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for (store = fmt; c = *fmt; ++fmt, ++store) {
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if (c != '\\') {
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*store = c;
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continue;
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}
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switch (*++fmt) {
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case '\0': /* EOS, user error */
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*store = '\\';
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*++store = '\0';
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return;
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case '\\': /* backslash */
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case '\'': /* single quote */
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*store = *fmt;
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break;
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case 'a': /* bell/alert */
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*store = '\7';
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break;
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case 'b': /* backspace */
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*store = '\b';
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break;
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case 'f': /* form-feed */
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*store = '\f';
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break;
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case 'n': /* newline */
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*store = '\n';
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break;
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case 'r': /* carriage-return */
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*store = '\r';
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break;
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case 't': /* horizontal tab */
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*store = '\t';
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break;
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case 'v': /* vertical tab */
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*store = '\13';
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break;
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/* octal constant */
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case '0': case '1': case '2': case '3':
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case '4': case '5': case '6': case '7':
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for (c = 3, value = 0;
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c-- && *fmt >= '0' && *fmt <= '7'; ++fmt) {
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value <<= 3;
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value += *fmt - '0';
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}
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--fmt;
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*store = value;
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break;
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default:
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*store = *fmt;
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break;
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}
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}
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*store = '\0';
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}
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getchr()
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{
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if (!*gargv)
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return((int)'\0');
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return((int)**gargv++);
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}
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char *
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getstr()
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{
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if (!*gargv)
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return("");
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return(*gargv++);
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}
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static char *number = "+-.0123456789";
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getint()
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{
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if (!*gargv)
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return(0);
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if (index(number, **gargv))
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return(atoi(*gargv++));
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return(asciicode());
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}
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long
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getlong()
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{
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long atol();
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if (!*gargv)
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return((long)0);
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if (index(number, **gargv))
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return(strtol(*gargv++, (char **)NULL, 0));
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return((long)asciicode());
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}
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double
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getdouble()
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{
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double atof();
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if (!*gargv)
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return((double)0);
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if (index(number, **gargv))
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return(atof(*gargv++));
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return((double)asciicode());
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}
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asciicode()
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{
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register char ch;
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ch = **gargv;
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if (ch == '\'' || ch == '"')
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ch = (*gargv)[1];
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++gargv;
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return(ch);
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}
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