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/* |
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* Copyright (C) 1984-2012 Mark Nudelman |
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* Modified for use with illumos by Garrett D'Amore. |
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* Copyright 2014 Garrett D'Amore <garrett@damore.org> |
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* |
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* You may distribute under the terms of either the GNU General Public |
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* License or the Less License, as specified in the README file. |
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* |
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* For more information, see the README file. |
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*/ |
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/* |
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* Operating system dependent routines. |
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* |
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* Most of the stuff in here is based on Unix, but an attempt |
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* has been made to make things work on other operating systems. |
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* This will sometimes result in a loss of functionality, unless |
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* someone rewrites code specifically for the new operating system. |
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* |
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* The makefile provides defines to decide whether various |
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* Unix features are present. |
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*/ |
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#include <errno.h> |
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#include <signal.h> |
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#include <time.h> |
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#include "less.h" |
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extern volatile sig_atomic_t sigs; |
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/* |
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* Like read() system call, but is deliberately interruptible. |
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*/ |
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int |
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iread(int fd, unsigned char *buf, unsigned int len) |
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{ |
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7432 |
int n; |
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start: |
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3716 |
flush(0); |
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n = read(fd, buf, len); |
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✓✓ |
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if (n < 0) { |
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/* |
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* Certain values of errno indicate we should just retry the |
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* read. |
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*/ |
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✓✗ |
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if (errno == EINTR) |
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return (READ_INTR); |
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if (errno == EAGAIN) |
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goto start; |
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return (-1); |
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} |
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3715 |
return (n); |
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} |
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/* |
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* errno_message: Return an error message based on the value of "errno". |
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*/ |
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char * |
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errno_message(char *filename) |
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{ |
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return (easprintf("%s: %s", filename, strerror(errno))); |
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} |
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static off_t |
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muldiv(off_t val, off_t num, off_t den) |
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{ |
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double v = (((double)val) * num) / den; |
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return ((off_t)(v + 0.5)); |
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} |
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/* |
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* Return the ratio of two off_t, as a percentage. |
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* {{ Assumes a off_t is a long int. }} |
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*/ |
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int |
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percentage(off_t num, off_t den) |
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{ |
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return ((int)muldiv(num, (off_t)100, den)); |
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} |
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/* |
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* Return the specified percentage of a off_t. |
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*/ |
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off_t |
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percent_pos(off_t pos, int percent, long fraction) |
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{ |
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/* |
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* Change percent (parts per 100) to perden |
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* (parts per NUM_FRAC_DENOM). |
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*/ |
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off_t perden = (percent * (NUM_FRAC_DENOM / 100)) + (fraction / 100); |
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✓✗ |
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if (perden == 0) |
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return (0); |
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return (muldiv(pos, perden, (off_t)NUM_FRAC_DENOM)); |
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} |