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Annotation of src/usr.bin/less/os.c, Revision 1.16

1.1       etheisen    1: /*
1.11      shadchin    2:  * Copyright (C) 1984-2012  Mark Nudelman
1.14      nicm        3:  * Modified for use with illumos by Garrett D'Amore.
                      4:  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
1.1       etheisen    5:  *
1.6       millert     6:  * You may distribute under the terms of either the GNU General Public
                      7:  * License or the Less License, as specified in the README file.
1.1       etheisen    8:  *
1.11      shadchin    9:  * For more information, see the README file.
1.12      nicm       10:  */
1.1       etheisen   11:
                     12: /*
                     13:  * Operating system dependent routines.
                     14:  *
                     15:  * Most of the stuff in here is based on Unix, but an attempt
                     16:  * has been made to make things work on other operating systems.
                     17:  * This will sometimes result in a loss of functionality, unless
                     18:  * someone rewrites code specifically for the new operating system.
                     19:  *
                     20:  * The makefile provides defines to decide whether various
                     21:  * Unix features are present.
                     22:  */
                     23:
1.16    ! mmcc       24: #include <errno.h>
1.1       etheisen   25: #include <signal.h>
                     26: #include <time.h>
1.16    ! mmcc       27:
        !            28: #include "less.h"
1.1       etheisen   29:
1.10      millert    30: extern volatile sig_atomic_t sigs;
1.6       millert    31:
1.1       etheisen   32: /*
                     33:  * Like read() system call, but is deliberately interruptible.
                     34:  */
1.12      nicm       35: int
                     36: iread(int fd, unsigned char *buf, unsigned int len)
1.1       etheisen   37: {
1.12      nicm       38:        int n;
1.1       etheisen   39:
1.8       shadchin   40: start:
1.15      nicm       41:        flush(0);
1.1       etheisen   42:        n = read(fd, buf, len);
1.12      nicm       43:        if (n < 0) {
1.8       shadchin   44:                /*
1.12      nicm       45:                 * Certain values of errno indicate we should just retry the
                     46:                 * read.
1.8       shadchin   47:                 */
                     48:                if (errno == EINTR)
1.9       millert    49:                        return (READ_INTR);
1.8       shadchin   50:                if (errno == EAGAIN)
                     51:                        goto start;
                     52:                return (-1);
                     53:        }
1.1       etheisen   54:        return (n);
                     55: }
                     56:
                     57: /*
                     58:  * errno_message: Return an error message based on the value of "errno".
                     59:  */
1.12      nicm       60: char *
                     61: errno_message(char *filename)
1.1       etheisen   62: {
1.12      nicm       63:        return (easprintf("%s: %s", filename, strerror(errno)));
1.1       etheisen   64: }
                     65:
1.12      nicm       66: static off_t
                     67: muldiv(off_t val, off_t num, off_t den)
1.8       shadchin   68: {
1.12      nicm       69:        double v = (((double)val) * num) / den;
                     70:        return ((off_t)(v + 0.5));
1.8       shadchin   71: }
                     72:
1.1       etheisen   73: /*
1.12      nicm       74:  * Return the ratio of two off_t, as a percentage.
                     75:  * {{ Assumes a off_t is a long int. }}
1.6       millert    76:  */
1.12      nicm       77: int
                     78: percentage(off_t num, off_t den)
1.6       millert    79: {
1.12      nicm       80:        return ((int)muldiv(num, (off_t)100, den));
1.6       millert    81: }
                     82:
                     83: /*
1.12      nicm       84:  * Return the specified percentage of a off_t.
1.1       etheisen   85:  */
1.12      nicm       86: off_t
                     87: percent_pos(off_t pos, int percent, long fraction)
1.1       etheisen   88: {
1.12      nicm       89:        /*
                     90:         * Change percent (parts per 100) to perden
                     91:         * (parts per NUM_FRAC_DENOM).
                     92:         */
                     93:        off_t perden = (percent * (NUM_FRAC_DENOM / 100)) + (fraction / 100);
1.6       millert    94:
1.8       shadchin   95:        if (perden == 0)
1.6       millert    96:                return (0);
1.12      nicm       97:        return (muldiv(pos, perden, (off_t)NUM_FRAC_DENOM));
1.6       millert    98: }