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https://github.com/fish-shell/fish-shell
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424 lines
12 KiB
C
424 lines
12 KiB
C
/** \file common.h
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Prototypes for various functions, mostly string utilities, that are used by most parts of fish.
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*/
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#ifndef FISH_COMMON_H
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/**
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Header guard
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*/
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#define FISH_COMMON_H
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#include <stdlib.h>
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#include <stdio.h>
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#include <wchar.h>
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#include <termios.h>
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#include "util.h"
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/**
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Maximum number of bytes used by a single utf-8 character
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*/
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#define MAX_UTF8_BYTES 6
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/**
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This is in the unicode private use area.
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*/
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#define ENCODE_DIRECT_BASE 0xf100
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/**
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Highest legal ascii value
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*/
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#define ASCII_MAX 127u
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/**
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Highest legal 16-bit unicode value
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*/
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#define UCS2_MAX 0xffffu
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/**
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Highest legal byte value
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*/
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#define BYTE_MAX 0xffu
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#define UNESCAPE_SPECIAL 1
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#define UNESCAPE_INCOMPLETE 2
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/**
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Save the shell mode on startup so we can restore them on exit
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*/
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extern struct termios shell_modes;
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/**
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The character to use where the text has been truncated. Is an
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ellipsis on unicode system and a $ on other systems.
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*/
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extern wchar_t ellipsis_char;
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/**
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The verbosity level of fish. If a call to debug has a severity
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level higher than \c debug_level, it will not be printed.
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*/
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extern int debug_level;
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/**
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Profiling flag. True if commands should be profiled.
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*/
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extern char *profile;
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/**
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Name of the current program. Should be set at startup. Used by the
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debug function.
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*/
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extern wchar_t *program_name;
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/**
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This macro is used to check that an input argument is not null. It
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is a bit lika a non-fatal form of assert. Instead of exit-ing on
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failiure, the current function is ended at once. The second
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parameter is the return value of the current function on failiure.
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*/
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#define CHECK( arg, retval ) \
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if( !(arg) ) \
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{ \
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debug( 0, \
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_( L"function %s called with null value for argument %s. " ), \
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__func__, \
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#arg ); \
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bugreport(); \
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show_stackframe(); \
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return retval; \
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}
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/**
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Pause for input, then exit the program. If supported, print a backtrace first.
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*/
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#define FATAL_EXIT() \
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{ \
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char c; \
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show_stackframe(); \
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read( 0, &c, 1 ); \
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exit( 1 ); \
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} \
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/**
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Exit program at once, leaving an error message about running out of memory.
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*/
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#define DIE_MEM() \
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{ \
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fwprintf( stderr, \
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L"fish: Out of memory on line %d of file %s, shutting down fish\n", \
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__LINE__, \
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__FILE__ ); \
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FATAL_EXIT(); \
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}
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/**
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Check if signals are blocked. If so, print an error message and
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return from the function performing this check.
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*/
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#define CHECK_BLOCK( retval ) \
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if( signal_is_blocked() ) \
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{ \
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debug( 0, \
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_( L"function %s called while blocking signals. " ), \
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__func__); \
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bugreport(); \
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show_stackframe(); \
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return retval; \
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}
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/**
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Shorthand for wgettext call
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*/
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#define _(wstr) wgettext(wstr)
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/**
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Noop, used to tell xgettext that a string should be translated,
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even though it is not directly sent to wgettext.
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*/
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#define N_(wstr) wstr
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/*
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Print a stack trace to stderr
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*/
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void show_stackframe();
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/**
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Take an array_list_t containing wide strings and converts them to a
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single null-terminated wchar_t **. The array is allocated using
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malloc, and needs to be fred's by the caller.
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*/
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wchar_t **list_to_char_arr( array_list_t *l );
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/**
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Read a line from the stream f into the buffer buff of length len. If
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buff is to small, it will be reallocated, and both buff and len will
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be updated to reflect this. Returns the number of bytes read or -1
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on failiure.
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If the carriage return character is encountered, it is
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ignored. fgetws() considers the line to end if reading the file
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results in either a newline (L'\n') character, the null (L'\\0')
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character or the end of file (WEOF) character.
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*/
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int fgetws2( wchar_t **buff, int *len, FILE *f );
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/**
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Sorts an array_list of wide strings according to the
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wcsfilecmp-function from the util library
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*/
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void sort_list( array_list_t *comp );
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/**
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Returns a newly allocated wide character string equivalent of the
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specified multibyte character string
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This function encodes illegal character sequences in a reversible
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way using the private use area.
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*/
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wchar_t *str2wcs( const char *in );
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/**
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Converts the narrow character string \c in into it's wide
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equivalent, stored in \c out. \c out must have enough space to fit
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the entire string.
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This function encodes illegal character sequences in a reversible
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way using the private use area.
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*/
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wchar_t *str2wcs_internal( const char *in, wchar_t *out );
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/**
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Returns a newly allocated multibyte character string equivalent of
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the specified wide character string
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This function decodes illegal character sequences in a reversible
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way using the private use area.
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*/
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char *wcs2str( const wchar_t *in );
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/**
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Converts the wide character string \c in into it's narrow
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equivalent, stored in \c out. \c out must have enough space to fit
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the entire string.
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This function decodes illegal character sequences in a reversible
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way using the private use area.
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*/
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char *wcs2str_internal( const wchar_t *in, char *out );
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/**
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Returns a newly allocated wide character string array equivalent of
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the specified multibyte character string array
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*/
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char **wcsv2strv( const wchar_t **in );
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/**
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Returns a newly allocated multibyte character string array equivalent of the specified wide character string array
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*/
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wchar_t **strv2wcsv( const char **in );
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/**
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Returns a newly allocated concatenation of the specified wide
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character strings
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*/
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wchar_t *wcsdupcat( const wchar_t *a, const wchar_t *b );
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/**
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Returns a newly allocated concatenation of the specified wide
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character strings. The last argument must be a null pointer.
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*/
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__sentinel wchar_t *wcsdupcat2( const wchar_t *a, ... );
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/**
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Test if the given string is a valid variable name
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*/
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/**
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Test if the given string is a valid variable name.
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\return null if this is a valid name, and a pointer to the first invalid character otherwise
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*/
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wchar_t *wcsvarname( const wchar_t *str );
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/**
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Test if the given string is a valid function name.
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\return null if this is a valid name, and a pointer to the first invalid character otherwise
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*/
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wchar_t *wcsfuncname( const wchar_t *str );
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/**
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Test if the given string is valid in a variable name
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\return 1 if this is a valid name, 0 otherwise
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*/
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int wcsvarchr( wchar_t chr );
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/**
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A wcswidth workalike. Fish uses this since the regular wcswidth seems flaky.
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*/
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int my_wcswidth( const wchar_t *c );
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/**
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This functions returns the end of the quoted substring beginning at
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\c in. The type of quoting character is detemrined by examining \c
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in. Returns 0 on error.
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\param in the position of the opening quote
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*/
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wchar_t *quote_end( const wchar_t *in );
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/**
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A call to this function will reset the error counter. Some
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functions print out non-critical error messages. These should check
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the error_count before, and skip printing the message if
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MAX_ERROR_COUNT messages have been printed. The error_reset()
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should be called after each interactive command executes, to allow
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new messages to be printed.
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*/
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void error_reset();
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/**
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This function behaves exactly like a wide character equivalent of
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the C function setlocale, except that it will also try to detect if
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the user is using a Unicode character set, and if so, use the
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unicode ellipsis character as ellipsis, instead of '$'.
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*/
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const wchar_t *wsetlocale( int category, const wchar_t *locale );
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/**
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Checks if \c needle is included in the list of strings specified. A warning is printed if needle is zero.
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\param needle the string to search for in the list
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\return zero is needle is not found, of if needle is null, non-zero otherwise
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*/
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__sentinel int contains_str( const wchar_t *needle, ... );
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/**
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Call read while blocking the SIGCHLD signal. Should only be called
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if you _know_ there is data available for reading.
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*/
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int read_blocked(int fd, void *buf, size_t count);
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/**
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Issue a debug message with printf-style string formating and
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automatic line breaking. The string will begin with the string \c
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program_name, followed by a colon and a whitespace.
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Because debug is often called to tell the user about an error,
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before using wperror to give a specific error message, debug will
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never ever modify the value of errno.
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\param level the priority of the message. Lower number means higher priority. Messages with a priority_number higher than \c debug_level will be ignored..
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\param msg the message format string.
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Example:
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<code>debug( 1, L"Pi = %.3f", M_PI );</code>
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will print the string 'fish: Pi = 3.141', given that debug_level is 1 or higher, and that program_name is 'fish'.
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*/
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void debug( int level, const wchar_t *msg, ... );
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/**
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Replace special characters with backslash escape sequences. Newline is
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replaced with \n, etc.
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\param in The string to be escaped
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\param escape_all Whether all characters wich hold special meaning in fish (Pipe, semicolon, etc,) should be escaped, or only unprintable characters
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\return The escaped string, or 0 if there is not enough memory
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*/
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wchar_t *escape( const wchar_t *in, int escape_all );
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/**
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Expand backslashed escapes and substitute them with their unescaped
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counterparts. Also optionally change the wildcards, the tilde
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character and a few more into constants which are defined in a
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private use area of Unicode. This assumes wchar_t is a unicode
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character set.
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The result must be free()d. The original string is not modified. If
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an invalid sequence is specified, 0 is returned.
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*/
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wchar_t *unescape( const wchar_t * in,
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int escape_special );
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/**
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Attempt to acquire a lock based on a lockfile, waiting LOCKPOLLINTERVAL
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milliseconds between polls and timing out after timeout seconds,
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thereafter forcibly attempting to obtain the lock if force is non-zero.
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Returns 1 on success, 0 on failure.
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To release the lock the lockfile must be unlinked.
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A unique temporary file named by appending characters to the lockfile name
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is used; any pre-existing file of the same name is subject to deletion.
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*/
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int acquire_lock_file( const char *lockfile, const int timeout, int force );
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/**
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Returns the width of the terminal window, so that not all
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functions that use these values continually have to keep track of
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it.
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Only works if common_handle_winch is registered to handle winch signals.
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*/
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int common_get_width();
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/**
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Returns the height of the terminal window, so that not all
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functions that use these values continually have to keep track of
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it.
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Only works if common_handle_winch is registered to handle winch signals.
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*/
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int common_get_height();
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/**
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Handle a window change event by looking up the new window size and
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saving it in an internal variable used by common_get_wisth and
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common_get_height().
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*/
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void common_handle_winch( int signal );
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/**
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Write paragraph of output to the specified stringbuffer, and redo
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the linebreaks to fit the current screen.
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*/
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void write_screen( const wchar_t *msg, string_buffer_t *buff );
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/**
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Tokenize the specified string into the specified array_list_t.
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Each new element is allocated using malloc and must be freed by the
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caller.
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\param val the input string. The contents of this string is not changed.
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\param out the list in which to place the elements.
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*/
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void tokenize_variable_array( const wchar_t *val, array_list_t *out );
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/**
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Make sure the specified direcotry exists. If no, try to create it.
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\return 0 if the directory exists, -1 otherwise.
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*/
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int create_directory( wchar_t *d );
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/**
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Print a short message about how to file a bug report to stderr
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*/
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void bugreport();
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#endif
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