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Annotation of src/usr.bin/less/os.c, Revision 1.12

1.1       etheisen    1: /*
1.11      shadchin    2:  * Copyright (C) 1984-2012  Mark Nudelman
1.1       etheisen    3:  *
1.6       millert     4:  * You may distribute under the terms of either the GNU General Public
                      5:  * License or the Less License, as specified in the README file.
1.1       etheisen    6:  *
1.11      shadchin    7:  * For more information, see the README file.
1.1       etheisen    8:  */
1.12    ! nicm        9: /*
        !            10:  * Modified for use with illumos.
        !            11:  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
        !            12:  */
1.1       etheisen   13:
                     14: /*
                     15:  * Operating system dependent routines.
                     16:  *
                     17:  * Most of the stuff in here is based on Unix, but an attempt
                     18:  * has been made to make things work on other operating systems.
                     19:  * This will sometimes result in a loss of functionality, unless
                     20:  * someone rewrites code specifically for the new operating system.
                     21:  *
                     22:  * The makefile provides defines to decide whether various
                     23:  * Unix features are present.
                     24:  */
                     25:
                     26: #include "less.h"
                     27: #include <signal.h>
                     28: #include <time.h>
                     29: #include <errno.h>
                     30:
1.10      millert    31: extern volatile sig_atomic_t sigs;
1.6       millert    32:
1.1       etheisen   33: /*
                     34:  * Like read() system call, but is deliberately interruptible.
                     35:  */
1.12    ! nicm       36: int
        !            37: iread(int fd, unsigned char *buf, unsigned int len)
1.1       etheisen   38: {
1.12    ! nicm       39:        int n;
1.1       etheisen   40:
1.8       shadchin   41: start:
1.1       etheisen   42:        flush();
                     43:        n = read(fd, buf, len);
1.12    ! nicm       44:        if (n < 0) {
1.8       shadchin   45:                /*
1.12    ! nicm       46:                 * Certain values of errno indicate we should just retry the
        !            47:                 * read.
1.8       shadchin   48:                 */
                     49:                if (errno == EINTR)
1.9       millert    50:                        return (READ_INTR);
1.8       shadchin   51:                if (errno == EAGAIN)
                     52:                        goto start;
                     53:                return (-1);
                     54:        }
1.1       etheisen   55:        return (n);
                     56: }
                     57:
                     58: /*
                     59:  * Return the current time.
                     60:  */
1.12    ! nicm       61: long
        !            62: get_time(void)
1.1       etheisen   63: {
1.12    ! nicm       64:        time_t t;
1.1       etheisen   65:
1.12    ! nicm       66:        (void) time(&t);
1.1       etheisen   67:        return (t);
                     68: }
                     69:
                     70: /*
                     71:  * errno_message: Return an error message based on the value of "errno".
                     72:  */
1.12    ! nicm       73: char *
        !            74: errno_message(char *filename)
1.1       etheisen   75: {
1.12    ! nicm       76:        return (easprintf("%s: %s", filename, strerror(errno)));
1.1       etheisen   77: }
                     78:
1.12    ! nicm       79: static off_t
        !            80: muldiv(off_t val, off_t num, off_t den)
1.8       shadchin   81: {
1.12    ! nicm       82:        double v = (((double)val) * num) / den;
        !            83:        return ((off_t)(v + 0.5));
1.8       shadchin   84: }
                     85:
1.1       etheisen   86: /*
1.12    ! nicm       87:  * Return the ratio of two off_t, as a percentage.
        !            88:  * {{ Assumes a off_t is a long int. }}
1.6       millert    89:  */
1.12    ! nicm       90: int
        !            91: percentage(off_t num, off_t den)
1.6       millert    92: {
1.12    ! nicm       93:        return ((int)muldiv(num, (off_t)100, den));
1.6       millert    94: }
                     95:
                     96: /*
1.12    ! nicm       97:  * Return the specified percentage of a off_t.
1.1       etheisen   98:  */
1.12    ! nicm       99: off_t
        !           100: percent_pos(off_t pos, int percent, long fraction)
1.1       etheisen  101: {
1.12    ! nicm      102:        /*
        !           103:         * Change percent (parts per 100) to perden
        !           104:         * (parts per NUM_FRAC_DENOM).
        !           105:         */
        !           106:        off_t perden = (percent * (NUM_FRAC_DENOM / 100)) + (fraction / 100);
1.6       millert   107:
1.8       shadchin  108:        if (perden == 0)
1.6       millert   109:                return (0);
1.12    ! nicm      110:        return (muldiv(pos, perden, (off_t)NUM_FRAC_DENOM));
1.6       millert   111: }