declare optind

[unix-history] / usr / src / usr.bin / printf / printf.c

/*
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*/

#if !defined(BUILTIN) && !defined(SHELL)
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#endif

#ifndef lint
static char sccsid[] = "@(#)printf.c    5.14 (Berkeley) %G%";
#endif /* not lint */

#include <sys/types.h>

#include <err.h>
#include <errno.h>
#include <limits.h>
#ifdef SHELL
#define EOF     -1
#else
#include <stdio.h>
#endif
#include <stdlib.h>
#include <string.h>

/*
* XXX
* This *has* to go away.  TK.
*/
#ifdef SHELL
#define main printfcmd
#define warnx(a, b) {                                                   \
       char buf[64];                                                   \
       (void)sprintf(buf, sizeof(buf), a, b);                          \
       error(buf);                                                     \
}
#include "../../bin/sh/bltin/bltin.h"
#endif

#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); \
}

static int       asciicode __P((void));
static void      escape __P((char *));
static int       getchr __P((void));
static double    getdouble __P((void));
static int       getint __P((int *));
static int       getlong __P((long *));
static char     *getstr __P((void));
static char     *mklong __P((char *, int));
static void      usage __P((void));

static char **gargv;

int
#ifdef BUILTIN
progprintf(argc, argv)
#else
main(argc, argv)
#endif
       int argc;
       char *argv[];
{
       extern int optind;
       static char *skip1, *skip2;
       int ch, end, fieldwidth, precision;
       char convch, nextch, *format, *fmt, *start;

       while ((ch = getopt(argc, argv, "")) != EOF)
               switch (ch) {
               case '?':
               default:
                       usage();
                       return (1);
               }
       argc -= optind;
       argv += optind;

       if (argc < 1) {
               usage();
               return (1);
       }

       /*
        * 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";

       escape(fmt = format = *argv);           /* backslash interpretation */
       gargv = ++argv;
       for (;;) {
               end = 0;
               /* find next format specification */
next:           for (start = fmt;; ++fmt) {
                       if (!*fmt) {
                               /* avoid infinite loop */
                               if (end == 1) {
                                       warnx("missing format character", NULL);
                                       return (1);
                               }
                               end = 1;
                               if (fmt > start)
                                       (void)printf("%s", start);
                               if (!*gargv)
                                       return (0);
                               fmt = format;
                               goto next;
                       }
                       /* %% prints a % */
                       if (*fmt == '%') {
                               if (*++fmt != '%')
                                       break;
                               *fmt++ = '\0';
                               (void)printf("%s", start);
                               goto next;
                       }
               }

               /* skip to field width */
               for (; strchr(skip1, *fmt); ++fmt);
               if (*fmt == '*') {
                       if (getint(&fieldwidth))
                               return (1);
               } else
                       fieldwidth = 0;

               /* skip to possible '.', get following precision */
               for (; strchr(skip2, *fmt); ++fmt);
               if (*fmt == '.')
                       ++fmt;
               if (*fmt == '*') {
                       if (getint(&precision))
                               return (1);
               } else
                       precision = 0;

               /* skip to conversion char */
               for (; strchr(skip2, *fmt); ++fmt);
               if (!*fmt) {
                       warnx("missing format character", NULL);
                       return (1);
               }

               convch = *fmt;
               nextch = *++fmt;
               *fmt = '\0';
               switch(convch) {
               case 'c': {
                       char p;

                       p = getchr();
                       PF(start, p);
                       break;
               }
               case 's': {
                       char *p;

                       p = getstr();
                       PF(start, p);
                       break;
               }
               case 'd': case 'i': case 'o': case 'u': case 'x': case 'X': {
                       long p;
                       char *f;
                       
                       if ((f = mklong(start, convch)) == NULL)
                               return (1);
                       if (getlong(&p))
                               return (1);
                       PF(f, p);
                       break;
               }
               case 'e': case 'E': case 'f': case 'g': case 'G': {
                       double p;

                       p = getdouble();
                       PF(start, p);
                       break;
               }
               default:
                       warnx("illegal format character", NULL);
                       return (1);
               }
               *fmt = nextch;
       }
       /* NOTREACHED */
}

static char *
mklong(str, ch)
       char *str;
       int ch;
{
       static char copy[64];
       int len;

       len = strlen(str) + 2;
       memmove(copy, str, len - 3);
       copy[len - 3] = 'l';
       copy[len - 2] = ch;
       copy[len - 1] = '\0';
       return (copy);
}

static void
escape(fmt)
       register char *fmt;
{
       register char *store;
       register int value, c;

       for (store = fmt; c = *fmt; ++fmt, ++store) {
               if (c != '\\') {
                       *store = c;
                       continue;
               }
               switch (*++fmt) {
               case '\0':              /* EOS, user error */
                       *store = '\\';
                       *++store = '\0';
                       return;
               case '\\':              /* backslash */
               case '\'':              /* single quote */
                       *store = *fmt;
                       break;
               case 'a':               /* bell/alert */
                       *store = '\7';
                       break;
               case 'b':               /* backspace */
                       *store = '\b';
                       break;
               case 'f':               /* form-feed */
                       *store = '\f';
                       break;
               case 'n':               /* newline */
                       *store = '\n';
                       break;
               case 'r':               /* carriage-return */
                       *store = '\r';
                       break;
               case 't':               /* horizontal tab */
                       *store = '\t';
                       break;
               case 'v':               /* vertical tab */
                       *store = '\13';
                       break;
                                       /* octal constant */
               case '0': case '1': case '2': case '3':
               case '4': case '5': case '6': case '7':
                       for (c = 3, value = 0;
                           c-- && *fmt >= '0' && *fmt <= '7'; ++fmt) {
                               value <<= 3;
                               value += *fmt - '0';
                       }
                       --fmt;
                       *store = value;
                       break;
               default:
                       *store = *fmt;
                       break;
               }
       }
       *store = '\0';
}

static int
getchr()
{
       if (!*gargv)
               return ('\0');
       return ((int)**gargv++);
}

static char *
getstr()
{
       if (!*gargv)
               return ("");
       return (*gargv++);
}

static char *Number = "+-.0123456789";
static int
getint(ip)
       int *ip;
{
       long val;

       if (getlong(&val))
               return (1);
       if (val > INT_MAX) {
               errno = ERANGE;
               warn("%s", *gargv);
               return (1);
       }
       *ip = val;
       return (0);
}

static int
getlong(lp)
       long *lp;
{
       long val;
       char *ep;

       if (!*gargv) {
               *lp = 0;
               return (0);
       }
       if (strchr(Number, **gargv)) {
               errno = 0;
               val = strtol(*gargv, &ep, 0);
               if (*ep != '\0') {
                       warnx("%s: illegal number", *gargv);
                       return (1);
               }
               if (errno == ERANGE)
                       if (val == LONG_MAX) {
                               warn("%s", *gargv);
                               return (1);
                       }
                       if (val == LONG_MIN) {
                               warn("%s", *gargv);
                               return (1);
                       }
                       
               *lp = val;
               ++gargv;
               return (0);
       }
       *lp =  (long)asciicode();
       return (0);
}

static double
getdouble()
{
       if (!*gargv)
               return ((double)0);
       if (strchr(Number, **gargv))
               return (atof(*gargv++));
       return ((double)asciicode());
}

static int
asciicode()
{
       register int ch;

       ch = **gargv;
       if (ch == '\'' || ch == '"')
               ch = (*gargv)[1];
       ++gargv;
       return (ch);
}

static void
usage()
{
       (void)fprintf(stderr, "usage: printf format [arg ...]\n");
}