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Diffstat (limited to 'private/crt32/lowio/cgets.c')
| -rw-r--r-- | private/crt32/lowio/cgets.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/private/crt32/lowio/cgets.c b/private/crt32/lowio/cgets.c new file mode 100644 index 000000000..ad2a7f1c0 --- /dev/null +++ b/private/crt32/lowio/cgets.c @@ -0,0 +1,129 @@ +/*** +*cgets.c - buffered keyboard input +* +* Copyright (c) 1989-1993, Microsoft Corporation. All rights reserved. +* +*Purpose: +* defines _cgets() - read a string directly from console +* +*Revision History: +* 06-09-89 PHG Module created, based on asm version +* 03-12-90 GJF Made calling type _CALLTYPE1, added #include +* <cruntime.h> and fixed copyright. Also, cleaned +* up the formatting a bit. +* 06-05-90 SBM Recoded as pure 32-bit, using new file handle state bits +* 07-24-90 SBM Removed '32' from API names +* 08-13-90 SBM Compiles cleanly with -W3 +* 09-28-90 GJF New-style function declarator. +* 12-04-90 SRW Changed to include <oscalls.h> instead of <doscalls.h> +* 12-13-90 GJF Fixed a couple of bugs. +* 12-06-90 SRW Added _CRUISER_ and _WIN32 conditionals. +* 01-16-91 GJF ANSI naming. +* 01-25-91 SRW Get/SetConsoleMode parameters changed (_WIN32_) +* 02-18-91 SRW Get/SetConsoleMode required read/write access (_WIN32_) +* 02-19-91 SRW Adapt to OpenFile/CreateFile changes (_WIN32_) +* 02-25-91 MHL Adapt to ReadFile/WriteFile changes (_WIN32_) +* 07-26-91 GJF Took out init. stuff and cleaned up the error +* handling [_WIN32_]. +* 04-19-93 GJF Use ReadConsole instead of ReadFile. +* +*******************************************************************************/ + +#include <cruntime.h> +#include <oscalls.h> +#include <os2dll.h> +#include <conio.h> +#include <stdlib.h> + +/* + * mask to clear the bits required to be 0 in the handle state passed to + * DOSSETFHSTATE. + */ +#define FHSTATEMASK 0xffd07888 + +/* + * declaration for console handle + */ + +extern int _coninpfh; + +/*** +*char *_cgets(string) - read string from console +* +*Purpose: +* Reads a string from the console via DOSREAD on a cooked console +* handle. string[0] must contain the maximum length of the +* string. Returns pointer to str[2]. +* +* NOTE: _cgets() does NOT check the pushback character buffer (i.e., +* _chbuf). Thus, _cgets() will not return any character that is +* pushed back by the _ungetch() call. +* +*Entry: +* char *string - place to store read string, str[0] = max length. +* +*Exit: +* returns pointer to str[2], where the string starts. +* returns NULL if error occurs +* +*Exceptions: +* +*******************************************************************************/ + +char * __cdecl _cgets ( + char *string + ) +{ + ULONG oldstate; + ULONG num_read; + char *result; + + _mlock(_CONIO_LOCK); /* lock the console */ + + string[1] = 0; /* no chars read yet */ + result = &string[2]; + + if ( _coninpfh == -1 ) { + _munlock(_CONIO_LOCK); /* unlock the console */ + return(NULL); /* return failure */ + } + + GetConsoleMode( (HANDLE)_coninpfh, &oldstate ); + SetConsoleMode( (HANDLE)_coninpfh, ENABLE_LINE_INPUT | ENABLE_PROCESSED_INPUT | + ENABLE_ECHO_INPUT ); + + if ( !ReadConsole( (HANDLE)_coninpfh, + (LPVOID)result, + (unsigned char)string[0], + &num_read, + NULL ) + ) + result = NULL; + + if ( result != NULL ) { + + /* set length of string and null terminate it */ + + if (string[num_read] == '\r') { + string[1] = (char)(num_read - 2); + string[num_read] = '\0'; + } else if ( (num_read == (ULONG)(unsigned char)string[0]) && + (string[num_read + 1] == '\r') ) { + /* special case 1 - \r\n straddles the boundary */ + string[1] = (char)(num_read -1); + string[1 + num_read] = '\0'; + } else if ( (num_read == 1) && (string[2] == '\n') ) { + /* special case 2 - read a single '\n'*/ + string[1] = string[2] = '\0'; + } else { + string[1] = (char)num_read; + string[2 + num_read] = '\0'; + } + } + + SetConsoleMode( (HANDLE)_coninpfh, oldstate ); + + _munlock(_CONIO_LOCK); /* unlock the console */ + + return result; +} |