util.c
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上传日期:2007-04-14
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文件大小:8k
- /* util.c -- readline utility functions */
- /* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.
- This file is part of the GNU Readline Library, a library for
- reading lines of text with interactive input and history editing.
- The GNU Readline Library is free software; you can redistribute it
- and/or modify it under the terms of the GNU General Public License
- as published by the Free Software Foundation; either version 1, or
- (at your option) any later version.
- The GNU Readline Library is distributed in the hope that it will be
- useful, but WITHOUT ANY WARRANTY; without even the implied warranty
- of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- The GNU General Public License is often shipped with GNU software, and
- is generally kept in a file called COPYING or LICENSE. If you do not
- have a copy of the license, write to the Free Software Foundation,
- 675 Mass Ave, Cambridge, MA 02139, USA. */
- #define READLINE_LIBRARY
- #if defined (HAVE_CONFIG_H)
- # include <config.h>
- #endif
- #include <sys/types.h>
- #include <fcntl.h>
- #include "posixjmp.h"
- #if defined (HAVE_UNISTD_H)
- # include <unistd.h> /* for _POSIX_VERSION */
- #endif /* HAVE_UNISTD_H */
- #if defined (HAVE_STDLIB_H)
- # include <stdlib.h>
- #else
- # include "ansi_stdlib.h"
- #endif /* HAVE_STDLIB_H */
- #include <stdio.h>
- #include <ctype.h>
- /* System-specific feature definitions and include files. */
- #include "rldefs.h"
- #if defined (TIOCSTAT_IN_SYS_IOCTL)
- # include <sys/ioctl.h>
- #endif /* TIOCSTAT_IN_SYS_IOCTL */
- /* Some standard library routines. */
- #include "readline.h"
- #define SWAP(s, e) do { int t; t = s; s = e; e = t; } while (0)
- /* Pseudo-globals imported from readline.c */
- extern int readline_echoing_p;
- extern procenv_t readline_top_level;
- extern int rl_line_buffer_len;
- extern Function *rl_last_func;
- extern int _rl_defining_kbd_macro;
- extern char *_rl_executing_macro;
- /* Pseudo-global functions imported from other library files. */
- extern void _rl_replace_text ();
- extern void _rl_pop_executing_macro ();
- extern void _rl_set_the_line ();
- extern void _rl_init_argument ();
- extern char *xmalloc (), *xrealloc ();
- /* **************************************************************** */
- /* */
- /* Utility Functions */
- /* */
- /* **************************************************************** */
- /* Return 0 if C is not a member of the class of characters that belong
- in words, or 1 if it is. */
- int _rl_allow_pathname_alphabetic_chars = 0;
- static char *pathname_alphabetic_chars = "/-_=~.#$";
- int
- alphabetic (c)
- int c;
- {
- if (ALPHABETIC (c))
- return (1);
- return (_rl_allow_pathname_alphabetic_chars &&
- strchr (pathname_alphabetic_chars, c) != NULL);
- }
- /* How to abort things. */
- int
- _rl_abort_internal ()
- {
- ding ();
- rl_clear_message ();
- _rl_init_argument ();
- rl_pending_input = 0;
- _rl_defining_kbd_macro = 0;
- while (_rl_executing_macro)
- _rl_pop_executing_macro ();
- rl_last_func = (Function *)NULL;
- longjmp (readline_top_level, 1);
- return (0);
- }
- int
- rl_abort (count, key)
- int count, key;
- {
- return (_rl_abort_internal ());
- }
- int
- rl_tty_status (count, key)
- int count, key;
- {
- #if defined (TIOCSTAT)
- ioctl (1, TIOCSTAT, (char *)0);
- rl_refresh_line (count, key);
- #else
- ding ();
- #endif
- return 0;
- }
- /* Return a copy of the string between FROM and TO.
- FROM is inclusive, TO is not. */
- char *
- rl_copy_text (from, to)
- int from, to;
- {
- register int length;
- char *copy;
- /* Fix it if the caller is confused. */
- if (from > to)
- SWAP (from, to);
- length = to - from;
- copy = xmalloc (1 + length);
- strncpy (copy, rl_line_buffer + from, length);
- copy[length] = ' ';
- return (copy);
- }
- /* Increase the size of RL_LINE_BUFFER until it has enough space to hold
- LEN characters. */
- void
- rl_extend_line_buffer (len)
- int len;
- {
- while (len >= rl_line_buffer_len)
- {
- rl_line_buffer_len += DEFAULT_BUFFER_SIZE;
- rl_line_buffer = xrealloc (rl_line_buffer, rl_line_buffer_len);
- }
- _rl_set_the_line ();
- }
- /* A function for simple tilde expansion. */
- int
- rl_tilde_expand (ignore, key)
- int ignore, key;
- {
- register int start, end;
- char *homedir, *temp;
- int len;
- end = rl_point;
- start = end - 1;
- if (rl_point == rl_end && rl_line_buffer[rl_point] == '~')
- {
- homedir = tilde_expand ("~");
- _rl_replace_text (homedir, start, end);
- return (0);
- }
- else if (rl_line_buffer[start] != '~')
- {
- for (; !whitespace (rl_line_buffer[start]) && start >= 0; start--)
- ;
- start++;
- }
- end = start;
- do
- end++;
- while (whitespace (rl_line_buffer[end]) == 0 && end < rl_end);
- if (whitespace (rl_line_buffer[end]) || end >= rl_end)
- end--;
- /* If the first character of the current word is a tilde, perform
- tilde expansion and insert the result. If not a tilde, do
- nothing. */
- if (rl_line_buffer[start] == '~')
- {
- len = end - start + 1;
- temp = xmalloc (len + 1);
- strncpy (temp, rl_line_buffer + start, len);
- temp[len] = ' ';
- homedir = tilde_expand (temp);
- free (temp);
- _rl_replace_text (homedir, start, end);
- }
- return (0);
- }
- /* **************************************************************** */
- /* */
- /* String Utility Functions */
- /* */
- /* **************************************************************** */
- /* Determine if s2 occurs in s1. If so, return a pointer to the
- match in s1. The compare is case insensitive. */
- char *
- _rl_strindex (s1, s2)
- register char *s1, *s2;
- {
- register int i, l, len;
- for (i = 0, l = strlen (s2), len = strlen (s1); (len - i) >= l; i++)
- if (_rl_strnicmp (s1 + i, s2, l) == 0)
- return (s1 + i);
- return ((char *)NULL);
- }
- #if !defined (HAVE_STRCASECMP)
- /* Compare at most COUNT characters from string1 to string2. Case
- doesn't matter. */
- int
- _rl_strnicmp (string1, string2, count)
- char *string1, *string2;
- int count;
- {
- register char ch1, ch2;
- while (count)
- {
- ch1 = *string1++;
- ch2 = *string2++;
- if (_rl_to_upper(ch1) == _rl_to_upper(ch2))
- count--;
- else
- break;
- }
- return (count);
- }
- /* strcmp (), but caseless. */
- int
- _rl_stricmp (string1, string2)
- char *string1, *string2;
- {
- register char ch1, ch2;
- while (*string1 && *string2)
- {
- ch1 = *string1++;
- ch2 = *string2++;
- if (_rl_to_upper(ch1) != _rl_to_upper(ch2))
- return (1);
- }
- return (*string1 - *string2);
- }
- #endif /* !HAVE_STRCASECMP */
- /* Stupid comparison routine for qsort () ing strings. */
- int
- _rl_qsort_string_compare (s1, s2)
- char **s1, **s2;
- {
- #if defined (HAVE_STRCOLL)
- return (strcoll (*s1, *s2));
- #else
- int result;
- result = **s1 - **s2;
- if (result == 0)
- result = strcmp (*s1, *s2);
- return result;
- #endif
- }
- /* Function equivalents for the macros defined in chartypes.h. */
- #undef _rl_uppercase_p
- int
- _rl_uppercase_p (c)
- int c;
- {
- return (isupper (c));
- }
- #undef _rl_lowercase_p
- int
- _rl_lowercase_p (c)
- int c;
- {
- return (islower (c));
- }
- #undef _rl_pure_alphabetic
- int
- _rl_pure_alphabetic (c)
- int c;
- {
- return (isupper (c) || islower (c));
- }
- #undef _rl_digit_p
- int
- _rl_digit_p (c)
- int c;
- {
- return (isdigit (c));
- }
- #undef _rl_to_lower
- int
- _rl_to_lower (c)
- int c;
- {
- return (isupper (c) ? tolower (c) : c);
- }
- #undef _rl_to_upper
- int
- _rl_to_upper (c)
- int c;
- {
- return (islower (c) ? toupper (c) : c);
- }
- #undef _rl_digit_value
- int
- _rl_digit_value (c)
- int c;
- {
- return (isdigit (c) ? c - '0' : c);
- }
- /* Backwards compatibility, now that savestring has been removed from
- all `public' readline header files. */
- #undef _rl_savestring
- char *
- _rl_savestring (s)
- char *s;
- {
- return ((char *)strcpy (xmalloc (1 + (int)strlen (s)), (s)));
- }