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wc.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1992-2010 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * David Korn
 * AT&T Bell Laboratories
 *
 * count the number of bytes, words, and lines in a file
 */

static const char usage[] =
"[-?\n@(#)$Id: wc (AT&T Research) 2009-11-28 $\n]"
USAGE_LICENSE
"[+NAME?wc - print the number of bytes, words, and lines in files]"
"[+DESCRIPTION?\bwc\b reads one or more input files and, by default, "
      "for each file writes a line containing the number of newlines, "
      "\aword\as, and bytes contained in each file followed by the "
      "file name to standard output in that order.  A \aword\a is "
      "defined to be a non-zero length string delimited by \bisspace\b(3) "
      "characters.]"
"[+?If more than one file is specified, \bwc\b writes a total count "
      "for all of the named files with \btotal\b written instead "
      "of the file name.]"
"[+?By default, \bwc\b writes all three counts.  Options can specified "
      "so that only certain counts are written.  The options \b-c\b "
      "and \b-m\b are mutually exclusive.]"
"[+?If no \afile\a is given, or if the \afile\a is \b-\b, \bwc\b "
        "reads from standard input and no filename is written to standard "
      "output.  The start of the file is defined as the current offset.]"
"[l:lines?List the line counts.]"
"[w:words?List the word counts.]"
"[c:bytes|chars:chars?List the byte counts.]"
"[m|C:multibyte-chars?List the character counts.]"
"[q:quiet?Suppress invalid multibyte character warnings.]"
"[L:longest-line|max-line-length?List the longest line length; the newline,"
    "if any, is not counted in the length.]"
"[N!:utf8?For \bUTF-8\b locales \b--noutf8\b disables \bUTF-8\b "
    "optimzations and relies on the native \bmbtowc\b(3).]"
"\n"
"\n[file ...]\n"
"\n"
"[+EXIT STATUS?]{"
        "[+0?All files processed successfully.]"
        "[+>0?One or more files failed to open or could not be read.]"
"}"
"[+SEE ALSO?\bcat\b(1), \bisspace\b(3)]"
;


#include <cmd.h>
#include <wc.h>
#include <ls.h>

#define ERRORMAX  125

static void printout(register Wc_t *wp, register char *name,register int mode)
{
      if (mode&WC_LINES)
            sfprintf(sfstdout," %7I*d",sizeof(wp->lines),wp->lines);
      if (mode&WC_WORDS)
            sfprintf(sfstdout," %7I*d",sizeof(wp->words),wp->words);
      if (mode&WC_CHARS)
            sfprintf(sfstdout," %7I*d",sizeof(wp->chars),wp->chars);
      if (mode&WC_LONGEST)
            sfprintf(sfstdout," %7I*d",sizeof(wp->chars),wp->longest);
      if (name)
            sfprintf(sfstdout," %s",name);
      sfputc(sfstdout,'\n');
}

int
b_wc(int argc,register char **argv, void* context)
{
      register char     *cp;
      register int      mode=0, n;
      register Wc_t     *wp;
      Sfio_t            *fp;
      Sfoff_t           tlines=0, twords=0, tchars=0;
      struct stat statb;

      cmdinit(argc, argv, context, ERROR_CATALOG, 0);
      for (;;)
      {
            switch (optget(argv, usage))
            {
            case 'c':
                  mode |= WC_CHARS;
                  continue;
            case 'l':
                  mode |= WC_LINES;
                  continue;
            case 'L':
                  mode |= WC_LONGEST;
                  continue;
            case 'N':
                  if (!opt_info.num)
                        mode |= WC_NOUTF8;
                  continue;
            case 'm':
            case 'C':
                  mode |= WC_MBYTE;
                  continue;
            case 'q':
                  mode |= WC_QUIET;
                  continue;
            case 'w':
                  mode |= WC_WORDS;
                  continue;
            case ':':
                  error(2, "%s", opt_info.arg);
                  break;
            case '?':
                  error(ERROR_usage(2), "%s", opt_info.arg);
                  break;
            }
            break;
      }
      argv += opt_info.index;
      if (error_info.errors)
            error(ERROR_usage(2), "%s", optusage(NiL));
      if (mode&WC_MBYTE)
      {
            if (mode&WC_CHARS)
                  error(2, "-c and -C are mutually exclusive");
            if (!mbwide())
                  mode &= ~WC_MBYTE;
            mode |= WC_CHARS;
      }
      if (!(mode&(WC_WORDS|WC_CHARS|WC_LINES|WC_MBYTE|WC_LONGEST)))
            mode |= (WC_WORDS|WC_CHARS|WC_LINES);
      if (!(wp = wc_init(mode)))
            error(3,"internal error");
      if (cp = *argv)
            argv++;
      n = 0;
      do
      {
            if (!cp || streq(cp,"-"))
                  fp = sfstdin;
            else if (!(fp = sfopen(NiL,cp,"r")))
            {
                  error(ERROR_system(0),"%s: cannot open",cp);
                  continue;
            }
            if (cp)
                  n++;
            if (!(mode&(WC_WORDS|WC_LINES|WC_MBYTE|WC_LONGEST)) && fstat(sffileno(fp),&statb)>=0
                   && S_ISREG(statb.st_mode))
            {
                  wp->chars = statb.st_size - lseek(sffileno(fp),0L,1);
                  lseek(sffileno(fp),0L,2);
            }
            else
                  wc_count(wp, fp, cp);
            if (fp!=sfstdin)
                  sfclose(fp);
            tchars += wp->chars;
            twords += wp->words;
            tlines += wp->lines;
            printout(wp,cp,mode);
      } while (cp= *argv++);
      if (n > 1)
      {
            wp->lines = tlines;
            wp->chars = tchars;
            wp->words = twords;
            printout(wp,"total",mode);
      }
      return error_info.errors<ERRORMAX?error_info.errors:ERRORMAX;
}

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