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/*

 *  eolstrip - strip white space from end of lines

 *

 *  This program strips the white space from the end of every line in the

 *  specified program.

 *

 *  usage:  eolstrip  [ -v ] [ arg ... ] files...

 *           -v          -- verbose

 *

 * $Id: eolstrip.c,v 1.2 2001-09-27 12:02:53 chris Exp $

 */

#define GETOPTARGS "vt"

char *USAGE = "\

usage:  cklength  [ -v ] [ arg ... ] files... \n\

            -v          -- verbose\n\

            -t          -- test only .. DO NOT OVERWRITE FILE!!!\n\

\n\

Strip the white space from the end of every line on the list of files.\n\

";

#include <stdio.h>

#include <stdlib.h>

#include <fcntl.h>

#include <ctype.h>

#include <stdlib.h>

#include <unistd.h>

#include <string.h>

#include <memory.h>

#include <stdarg.h>

#include <errno.h>

#include "config.h"

#ifndef VMS

#ifndef HAVE_STRERROR

extern int sys_nerr;

extern char *sys_errlist[];

#define strerror( _err ) \

  ((_err) < sys_nerr) ? sys_errlist [(_err)] : "unknown error"

#else   /* HAVE_STRERROR */

char *strerror ();

#endif

#else   /* VMS */

char *strerror (int,...);

#endif

#define BUFFER_SIZE     2048

#define MAX_PATH        2048

#define SUCCESS         0

#define FAILURE         -1

#define Failed(x)       (((int) (x)) == FAILURE)

#define TRUE    1

#define FALSE   0

#define STREQ(a,b)      (strcmp(a,b) == 0)

#define NUMELEMS(arr)   (sizeof(arr) / sizeof(arr[0]))

/*

 * Definitions for unsigned "ints"; especially for use in data structures

 *  that will be shared among (potentially) different cpu's (we punt on

 *  byte ordering problems tho)

 */

typedef unsigned char   u8;

typedef unsigned short  u16;

typedef unsigned long   u32;

/*

 * vars controlled by command line options

 */

int verbose = FALSE;                    /* be verbose */

int test_only = FALSE;                  /* test only */

extern char *optarg;                    /* getopt(3) control vars */

extern int optind, opterr;

char *progname;                         /* for error() */

int process(char *arg);

void error(int errn, ...);

long getparm(char *s, long min, long max, char *msg);

#define ERR_ERRNO  (1<<((sizeof(int) * 8) - 2)) /* hi bit; use 'errno' */

#define ERR_FATAL  (ERR_ERRNO / 2)              /* fatal error ; no return */

#define ERR_ABORT  (ERR_ERRNO / 4)              /* fatal error ; abort */

#define ERR_MASK   (ERR_ERRNO | ERR_FATAL | ERR_ABORT) /* all */

#define stol(p) strtol(p, (char **) NULL, 0)

int  Open(), Read(), Write();

int main(

  int argc,

  char **argv

)

{

    register int c;

    int showusage = FALSE;                      /* usage error? */

    int rc = 0;

    /*

     * figure out invocation leaf-name

     */

    if ((progname = strrchr(argv[0], '/')) == (char *) NULL)

        progname = argv[0];

    else

        progname++;

    argv[0] = progname;                         /* for getopt err reporting */

    /*

     *  Check options and arguments.

     */

    opterr = 0;                                 /* we'll report all errors */

    while ((c = getopt(argc, argv, GETOPTARGS)) != EOF)

        switch (c)

        {

            case 't':                           /* toggle test only mode */

                test_only = ! test_only;

                break;

            case 'v':                           /* toggle verbose */

                verbose = ! verbose;

                break;

            case '?':

                showusage = TRUE;

        }

    if (showusage)

    {

        (void) fprintf(stderr, "%s", USAGE);

        exit(1);

    }

    /*

     *  traverse and process the arguments

     */

    for ( ; argv[optind]; optind++)

        if (Failed(process(argv[optind])))

            rc = FAILURE;

    return rc;

}

/*

 * process(arg)

 */

int

process(char *arg)

{

  FILE   *in;

  FILE   *out = (FILE *) 0;

  char    outname[ MAX_PATH ];

  char   *bptr;

  char    buffer[ BUFFER_SIZE ];

  int     length;

  int     line_number;

  int     rc = SUCCESS;  /* succeed by default */

  in = fopen( arg, "r" );

  if (!in)

    error( ERR_ERRNO | ERR_FATAL, "Unable to open file (%s)\n", arg );

  if ( !test_only ) {

    sprintf( outname, "%s.eoltmp", arg );

    out = fopen( outname, "w" );

    if (!out)

      error( ERR_ERRNO | ERR_FATAL, "Unable to open file (%s)\n", arg );

  }

  if ( verbose )

    fprintf( stderr, "Processing %s\n", arg );

  for ( line_number=1 ; ; line_number++ ) {

    bptr = fgets( buffer, BUFFER_SIZE, in );

    if (!bptr)

      break;

    /*

     *  Don't count the carriage return.

     */

    length = strlen( buffer ) - 1;

    if ( buffer[ length ] != '\n' )

      error(ERR_ERRNO|ERR_FATAL, "Line %d too long in %s\n", line_number, arg);

    while ( isspace( (int) buffer[ length ] ) )

      buffer[ length-- ] = '\0';

    if ( test_only ) {

      fprintf( stderr, "%s\n", arg );

      break;

    }

    fprintf( out, "%s\n", buffer );

  }

  fclose( in );

  if ( !test_only ) {

    fclose( out );

    rename( outname, arg );

  }

  return rc;

}

/*

 * error(errn, arglist)

 *      report an error to stderr using printf(3) conventions.

 *      Any output is preceded by '<progname>: '

 *

 * Uses ERR_FATAL bit to request exit(errn)

 *      ERR_ABORT to request abort()

 *      ERR_ERRNO to indicate use of errno instead of argument.

 *

 * If resulting 'errn' is non-zero, it is assumed to be an 'errno' and its

 *      associated error message is appended to the output.

 */

/*VARARGS*/

void

error(int error_flag, ...)

{

    va_list arglist;

    register char *format;

    int local_errno;

    extern int errno;

    (void) fflush(stdout);          /* in case stdout/stderr same */

    local_errno = error_flag & ~ERR_MASK;

    if (error_flag & ERR_ERRNO)     /* use errno? */

        local_errno = errno;

    va_start(arglist, error_flag);

    format = va_arg(arglist, char *);

    (void) fprintf(stderr, "%s: ", progname);

    (void) vfprintf(stderr, format, arglist);

    va_end(arglist);

    if (local_errno)

      (void) fprintf(stderr, " (%s)\n", strerror(local_errno));

    else

      (void) fprintf(stderr, "\n");

    (void) fflush(stderr);

    if (error_flag & (ERR_FATAL | ERR_ABORT))

    {

        if (error_flag & ERR_FATAL)

        {

            error(0, "fatal error, exiting");

            exit(local_errno ? local_errno : 1);

        }

        else

        {

            error(0, "fatal error, aborting");

            abort();

        }

    }

}

long

getparm(char *s,

        long min,

        long max,

        char *msg)

{

    long val;

    if ( ! strchr("0123456789-", *s))

    {

        error(ERR_FATAL, "'%s' is not a number", s);

        return min;

    }

    val = strtol(s, (char **) NULL, 0);

    if ((val < min) || (val > max))

    {

        if (min == max)

            error(ERR_FATAL, "%s can only be %ld", s, min);

        else

            error(ERR_FATAL, "%s must be between %ld and %ld", msg, min, max);

    }

    return val;

}

/*

 * Open()

 *      Perform open(2), returning the file descriptor.  Prints

 *      error message if open fails.

 */

int

Open(char *file,

     int oflag,

     int mode)

{

    int O_fd;

    if (Failed(O_fd = open(file, oflag, mode)))

        error(

          ERR_ERRNO | ERR_FATAL,

          "open('%s', 0x%x, 0%o) failed", file, oflag, mode

        );

    return O_fd;

}

/*

 * Read()

 *      Perform read(2); prints error message if fails.

 */

int

Read(int file,

     char *buffer,

     unsigned int count)

{

    int nbytes;

    if (Failed(nbytes = read(file, buffer, count)))

        error(

          ERR_ERRNO | ERR_FATAL,

          "read(%d, 0x%x, %d) failed", file, buffer, count

        );

    return nbytes;

}

/*

 * Write()

 *      Perform write(2); prints error message if fails.

 */

int

Write(int file,

      char *buffer,

      unsigned int count)

{

    int nbytes;

    if (Failed(nbytes = write(file, buffer, count)))

        error(

          ERR_ERRNO | ERR_FATAL,

          "write(%d, 0x%x, %d) failed", file, buffer, count

        );

    return nbytes;

}