mirror of
https://github.com/fish-shell/fish-shell
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175 lines
3.1 KiB
C++
175 lines
3.1 KiB
C++
/** \file util.c
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Generic utilities library.
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Contains datastructures such as automatically growing array lists, priority queues, etc.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <wchar.h>
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#include <math.h>
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#include <sys/time.h>
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#include <stdarg.h>
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#include <string.h>
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#include <ctype.h>
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#include <wctype.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <errno.h>
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#include <assert.h>
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#include "fallback.h"
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#include "util.h"
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#include "common.h"
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#include "wutil.h"
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/**
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Minimum allocated size for data structures. Used to avoid excessive
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memory allocations for lists, hash tables, etc, which are nearly
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empty.
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*/
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#define MIN_SIZE 32
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/**
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Maximum number of characters that can be inserted using a single
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call to sb_printf. This is needed since vswprintf doesn't tell us
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what went wrong. We don't know if we ran out of space or something
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else went wrong. We assume that any error is an out of memory-error
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and try again until we reach this size. After this size has been
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reached, it is instead assumed that something was wrong with the
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format string.
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*/
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#define SB_MAX_SIZE (128*1024*1024)
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/**
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Handle oom condition. Default action is to print a stack trace and
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exit, but an alternative action can be specified.
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*/
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#define oom_handler( p ) \
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{ \
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if( oom_handler_internal == util_die_on_oom ) \
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{ \
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DIE_MEM(); \
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} \
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oom_handler_internal( p ); \
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} \
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void util_die_on_oom( void * p);
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void (*oom_handler_internal)(void *) = &util_die_on_oom;
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void (*util_set_oom_handler( void (*h)(void *) ))(void *)
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{
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void (*old)(void *) = oom_handler_internal;
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if( h )
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oom_handler_internal = h;
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else
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oom_handler_internal = &util_die_on_oom;
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return old;
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}
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void util_die_on_oom( void *p )
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{
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}
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int mini( int a,
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int b )
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{
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return a<b?a:b;
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}
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int maxi( int a,
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int b )
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{
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return a>b?a:b;
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}
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int wcsfilecmp( const wchar_t *a, const wchar_t *b )
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{
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CHECK( a, 0 );
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CHECK( b, 0 );
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if( *a==0 )
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{
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if( *b==0)
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return 0;
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return -1;
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}
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if( *b==0 )
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{
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return 1;
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}
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int secondary_diff=0;
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if( iswdigit( *a ) && iswdigit( *b ) )
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{
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wchar_t *aend, *bend;
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long al;
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long bl;
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int diff;
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errno = 0;
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al = wcstol( a, &aend, 10 );
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bl = wcstol( b, &bend, 10 );
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if( errno )
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{
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/*
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Huuuuuuuuge numbers - fall back to regular string comparison
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*/
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return wcscmp( a, b );
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}
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diff = al - bl;
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if( diff )
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return diff>0?2:-2;
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secondary_diff = (aend-a) - (bend-b);
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a=aend-1;
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b=bend-1;
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}
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else
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{
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int diff = towlower(*a) - towlower(*b);
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if( diff != 0 )
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return (diff>0)?2:-2;
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secondary_diff = *a-*b;
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}
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int res = wcsfilecmp( a+1, b+1 );
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if( abs(res) < 2 )
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{
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/*
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No primary difference in rest of string.
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Use secondary difference on this element if found.
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*/
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if( secondary_diff )
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{
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return secondary_diff>0?1:-1;
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}
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}
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return res;
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}
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long long get_time()
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{
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struct timeval time_struct;
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gettimeofday( &time_struct, 0 );
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return 1000000ll*time_struct.tv_sec+time_struct.tv_usec;
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}
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