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gen_subs.c

/*    $OpenBSD: gen_subs.c,v 1.19 2007/04/04 21:55:10 millert Exp $     */
/*    $NetBSD: gen_subs.c,v 1.5 1995/03/21 09:07:26 cgd Exp $     */

/*-
 * Copyright (c) 1992 Keith Muller.
 * Copyright (c) 1992, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Keith Muller of the University of California, San Diego.
 *
 * 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. 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
#if 0
static const char sccsid[] = "@(#)gen_subs.c    8.1 (Berkeley) 5/31/93";
#else
static const char rcsid[] = "$OpenBSD: gen_subs.c,v 1.19 2007/04/04 21:55:10 millert Exp $";
#endif
#endif /* not lint */

#include <sys/types.h>
#include <sys/sysmacros.h>
#include <sys/time.h>
#include <time.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <stdio.h>
#include "tzfile.h"
#include <utmp.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include "vis.h"
#include "pax.h"
#include "extern.h"

#include "strmode.h"

/*
 * a collection of general purpose subroutines used by pax
 */

/*
 * constants used by ls_list() when printing out archive members
 */
#define MODELEN 20
#define DATELEN 64
#define DAYSPERNYEAR 365
/* #define SECSPERDAY 86400 */
/* #define VIS_CSTYLE 0 */
#define SIXMONTHS  ((DAYSPERNYEAR / 2) * SECSPERDAY)
#define CURFRMT         "%b %e %H:%M"
#define OLDFRMT         "%b %e  %Y"
#define NAME_WIDTH      8

/*
 * ls_list()
 *    list the members of an archive in ls format
 */

void
ls_list(ARCHD *arcn, time_t now, FILE *fp)
{
      struct stat *sbp;
      char f_mode[MODELEN];
      char f_date[DATELEN];
      const char *timefrmt;
      int term;

      term = zeroflag ? '\0' : '\n';      /* path termination character */

      /*
       * if not verbose, just print the file name
       */
      if (!vflag) {
            if (zeroflag)
                  (void)fputs(arcn->name, fp);
            else
                  safe_print(arcn->name, fp);
            (void)putc(term, fp);
            (void)fflush(fp);
            return;
      }

      /*
       * user wants long mode
       */
      sbp = &(arcn->sb);
      strmode(sbp->st_mode, f_mode);

      if (ltmfrmt == NULL) {
            /*
             * no locale specified format. time format based on age
             * compared to the time pax was started.
             */
            if ((sbp->st_mtime + SIXMONTHS) <= now)
                  timefrmt = OLDFRMT;
            else
                  timefrmt = CURFRMT;
      } else
            timefrmt = ltmfrmt;

      /*
       * print file mode, link count, uid, gid and time
       */
      if (strftime(f_date,DATELEN,timefrmt,localtime(&(sbp->st_mtime))) == 0)
            f_date[0] = '\0';
      (void)fprintf(fp, "%s%2u %-*.*s %-*.*s ", f_mode, sbp->st_nlink,
            NAME_WIDTH, UT_NAMESIZE, name_uid(sbp->st_uid, 1),
            NAME_WIDTH, UT_NAMESIZE, name_gid(sbp->st_gid, 1));

      /*
       * print device id's for devices, or sizes for other nodes
       */
      if ((arcn->type == PAX_CHR) || (arcn->type == PAX_BLK))
#           ifdef LONG_OFF_T
            (void)fprintf(fp, "%4u,%4u ", MAJOR(sbp->st_rdev),
#           else
            (void)fprintf(fp, "%4lu,%4lu ", (unsigned long)MAJOR(sbp->st_rdev),
#           endif
                (unsigned long)MINOR(sbp->st_rdev));
      else {
#           ifdef LONG_OFF_T
            (void)fprintf(fp, "%9lu ", sbp->st_size);
#           else
            (void)fprintf(fp, "%9qu ", sbp->st_size);
#           endif
      }

      /*
       * print name and link info for hard and soft links
       */
      (void)fputs(f_date, fp);
      (void)putc(' ', fp);
      safe_print(arcn->name, fp);
      if ((arcn->type == PAX_HLK) || (arcn->type == PAX_HRG)) {
            fputs(" == ", fp);
            safe_print(arcn->ln_name, fp);
      } else if (arcn->type == PAX_SLK) {
            fputs(" -> ", fp);
            safe_print(arcn->ln_name, fp);
      }
      (void)putc(term, fp);
      (void)fflush(fp);
      return;
}

/*
 * tty_ls()
 *    print a short summary of file to tty.
 */

void
ls_tty(ARCHD *arcn)
{
      char f_date[DATELEN];
      char f_mode[MODELEN];
      const char *timefrmt;

      if (ltmfrmt == NULL) {
            /*
             * no locale specified format
             */
            if ((arcn->sb.st_mtime + SIXMONTHS) <= time(NULL))
                  timefrmt = OLDFRMT;
            else
                  timefrmt = CURFRMT;
      } else
            timefrmt = ltmfrmt;

      /*
       * convert time to string, and print
       */
      if (strftime(f_date, DATELEN, timefrmt,
          localtime(&(arcn->sb.st_mtime))) == 0)
            f_date[0] = '\0';
      strmode(arcn->sb.st_mode, f_mode);
      tty_prnt("%s%s %s\n", f_mode, f_date, arcn->name);
      return;
}

void
safe_print(const char *str, FILE *fp)
{
      char visbuf[5];
      const char *cp;

      /*
       * if printing to a tty, use vis(3) to print special characters.
       */
      if (0 && isatty(fileno(fp))) {
            for (cp = str; *cp; cp++) {
                  (void)vis(visbuf, cp[0], VIS_CSTYLE, cp[1]);
                  (void)fputs(visbuf, fp);
            }
      } else {
            (void)fputs(str, fp);
      }
}

/*
 * asc_ul()
 *    convert hex/octal character string into a u_long. We do not have to
 *    check for overflow! (the headers in all supported formats are not large
 *    enough to create an overflow).
 *    NOTE: strings passed to us are NOT TERMINATED.
 * Return:
 *    unsigned long value
 */

u_long
asc_ul(char *str, int len, int base)
{
      char *stop;
      u_long tval = 0;

      stop = str + len;

      /*
       * skip over leading blanks and zeros
       */
      while ((str < stop) && ((*str == ' ') || (*str == '0')))
            ++str;

      /*
       * for each valid digit, shift running value (tval) over to next digit
       * and add next digit
       */
      if (base == HEX) {
            while (str < stop) {
                  if ((*str >= '0') && (*str <= '9'))
                        tval = (tval << 4) + (*str++ - '0');
                  else if ((*str >= 'A') && (*str <= 'F'))
                        tval = (tval << 4) + 10 + (*str++ - 'A');
                  else if ((*str >= 'a') && (*str <= 'f'))
                        tval = (tval << 4) + 10 + (*str++ - 'a');
                  else
                        break;
            }
      } else {
            while ((str < stop) && (*str >= '0') && (*str <= '7'))
                  tval = (tval << 3) + (*str++ - '0');
      }
      return(tval);
}

/*
 * ul_asc()
 *    convert an unsigned long into an hex/oct ascii string. pads with LEADING
 *    ascii 0's to fill string completely
 *    NOTE: the string created is NOT TERMINATED.
 */

int
ul_asc(u_long val, char *str, int len, int base)
{
      char *pt;
      u_long digit;

      /*
       * WARNING str is not '\0' terminated by this routine
       */
      pt = str + len - 1;

      /*
       * do a tailwise conversion (start at right most end of string to place
       * least significant digit). Keep shifting until conversion value goes
       * to zero (all digits were converted)
       */
      if (base == HEX) {
            while (pt >= str) {
                  if ((digit = (val & 0xf)) < 10)
                        *pt-- = '0' + (char)digit;
                  else
                        *pt-- = 'a' + (char)(digit - 10);
                  if ((val = (val >> 4)) == (u_long)0)
                        break;
            }
      } else {
            while (pt >= str) {
                  *pt-- = '0' + (char)(val & 0x7);
                  if ((val = (val >> 3)) == (u_long)0)
                        break;
            }
      }

      /*
       * pad with leading ascii ZEROS. We return -1 if we ran out of space.
       */
      while (pt >= str)
            *pt-- = '0';
      if (val != (u_long)0)
            return(-1);
      return(0);
}

#ifndef LONG_OFF_T
/*
 * asc_uqd()
 *    convert hex/octal character string into a u_quad_t. We do not have to
 *    check for overflow! (the headers in all supported formats are not large
 *    enough to create an overflow).
 *    NOTE: strings passed to us are NOT TERMINATED.
 * Return:
 *    u_quad_t value
 */

u_quad_t
asc_uqd(char *str, int len, int base)
{
      char *stop;
      u_quad_t tval = 0;

      stop = str + len;

      /*
       * skip over leading blanks and zeros
       */
      while ((str < stop) && ((*str == ' ') || (*str == '0')))
            ++str;

      /*
       * for each valid digit, shift running value (tval) over to next digit
       * and add next digit
       */
      if (base == HEX) {
            while (str < stop) {
                  if ((*str >= '0') && (*str <= '9'))
                        tval = (tval << 4) + (*str++ - '0');
                  else if ((*str >= 'A') && (*str <= 'F'))
                        tval = (tval << 4) + 10 + (*str++ - 'A');
                  else if ((*str >= 'a') && (*str <= 'f'))
                        tval = (tval << 4) + 10 + (*str++ - 'a');
                  else
                        break;
            }
      } else {
            while ((str < stop) && (*str >= '0') && (*str <= '7'))
                  tval = (tval << 3) + (*str++ - '0');
      }
      return(tval);
}

/*
 * uqd_asc()
 *    convert an u_quad_t into a hex/oct ascii string. pads with LEADING
 *    ascii 0's to fill string completely
 *    NOTE: the string created is NOT TERMINATED.
 */

int
uqd_asc(u_quad_t val, char *str, int len, int base)
{
      char *pt;
      u_quad_t digit;

      /*
       * WARNING str is not '\0' terminated by this routine
       */
      pt = str + len - 1;

      /*
       * do a tailwise conversion (start at right most end of string to place
       * least significant digit). Keep shifting until conversion value goes
       * to zero (all digits were converted)
       */
      if (base == HEX) {
            while (pt >= str) {
                  if ((digit = (val & 0xf)) < 10)
                        *pt-- = '0' + (char)digit;
                  else
                        *pt-- = 'a' + (char)(digit - 10);
                  if ((val = (val >> 4)) == (u_quad_t)0)
                        break;
            }
      } else {
            while (pt >= str) {
                  *pt-- = '0' + (char)(val & 0x7);
                  if ((val = (val >> 3)) == (u_quad_t)0)
                        break;
            }
      }

      /*
       * pad with leading ascii ZEROS. We return -1 if we ran out of space.
       */
      while (pt >= str)
            *pt-- = '0';
      if (val != (u_quad_t)0)
            return(-1);
      return(0);
}
#endif

/*
 * Copy at max min(bufz, fieldsz) chars from field to buf, stopping
 * at the first NUL char. NUL terminate buf if there is room left.
 */
size_t
fieldcpy(char *buf, size_t bufsz, const char *field, size_t fieldsz)
{
      char *p = buf;
      const char *q = field;
      size_t i = 0;

      if (fieldsz > bufsz)
            fieldsz = bufsz;
      while (i < fieldsz && *q != '\0') {
            *p++ = *q++;
            i++;
      }
      if (i < bufsz)
            *p = '\0';
      return(i);
}

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