C语言经典示例.zip

#include "tdestr.h" #include "common.h" #include "tdefunc.h" #include "define.h" int mark_block( WINDOW *window ) { int type; int num; long lnum; register file_infos *file; /* 临时文件 */ register WINDOW *win; /* 把当前窗口指针放到一个临时寄存器里面 */ int rc; win = window; file = win->file_info; if (win->rline > file->length || win->ll->len == EOF) return( ERROR ); if (g_status.marked == FALSE) { g_status.marked = TRUE; g_status.marked_file = file; } if (g_status.command == MarkBox) type = BOX; else if (g_status.command == MarkLine) type = LINE; else if (g_status.command == MarkStream) type = STREAM; else return( ERROR ); rc = OK; /* * 仅对于一个文件定义块。用户可以在这个文件的任何窗口进行操作。 */ if (file == g_status.marked_file) { /* * 不管块的模式标识块的起始和中止位置 */ if (file->block_type == NOTMARKED) { file->block_ec = file->block_bc = win->rcol; file->block_er = file->block_br = win->rline; } else { if (file->block_br > win->rline) { file->block_br = win->rline; if (file->block_bc < win->rcol && type != STREAM) file->block_ec = win->rcol; else file->block_bc = win->rcol; } else { if (type != STREAM) { file->block_ec = win->rcol; file->block_er = win->rline; } else { if (win->rline == file->block_br && win->rline == file->block_er) { if (win->rcol < file->block_bc) file->block_bc = win->rcol; else file->block_ec = win->rcol; } else if (win->rline == file->block_br) file->block_bc = win->rcol; else { file->block_ec = win->rcol; file->block_er = win->rline; } } } /* * 如果用户标识的块的终止位置在起始位置前，那么交换两个位置。 */ if (file->block_er < file->block_br) { lnum = file->block_er; file->block_er = file->block_br; file->block_br = lnum; } /* * 如果用户标识的块的终止列在起始列前，那么交换两个位置。 */ if ((file->block_ec < file->block_bc) && (type != STREAM || (type == STREAM && file->block_br == file->block_er))) { num = file->block_ec; file->block_ec = file->block_bc; file->block_bc = num; } } /* * 如果块类型已经被定义，但是如果用户使用混和模式，那么块的 * 类型被置为当前块的类型 */ if (file->block_type != NOTMARKED) { /* * 如果块的类型是矩形块，那么要保证左上角小于右下脚 * 如果块的类型是stream块，那么保证起始列小于中止列 */ if (type == BOX) { if (file->block_ec < file->block_bc) { num = file->block_ec; file->block_ec = file->block_bc; file->block_bc = num; } } } assert( file->block_er >= file->block_br ); file->block_type = type; file->dirty = GLOBAL; } else { /* * 已经定义好块 */ error( WARNING, win->bottom_line, block1 ); rc = ERROR; } return( rc ); } /* * Name: unmark_block * Class: primary editor function * Purpose: To set all block information to NULL or 0 * Date: June 5, 1991 * Passed: arg_filler: variable to match array of function pointers prototype * Notes: Reset all block variables if marked, otherwise return. * If a marked block is unmarked then redraw the screen(s). */ int unmark_block( WINDOW *arg_filler ) { register file_infos *marked_file; if (g_status.marked == TRUE) { marked_file = g_status.marked_file; g_status.marked = FALSE; g_status.marked_file = NULL; marked_file->block_start = NULL; marked_file->block_end = NULL; marked_file->block_bc = marked_file->block_ec = 0; marked_file->block_br = marked_file->block_er = 0l; if (marked_file->block_type) marked_file->dirty = GLOBAL; marked_file->block_type = NOTMARKED; } return( OK ); } /* * Name: restore_marked_block * Class: helper function * Purpose: To restore block beginning and ending row after an editing function * Date: June 5, 1991 * Passed: window: pointer to current window * net_change: number of bytes added or subtracted * Notes: If a change has been made before the marked block then the * beginning and ending row need to be adjusted by the number of * lines added or subtracted from file. */ void restore_marked_block( WINDOW *window, int net_change ) { long length; register file_infos *marked_file; if (g_status.marked == TRUE && net_change != 0) { marked_file = g_status.marked_file; length = marked_file->length; /* * restore is needed only if a block is defined and window->file_info is * same as marked file and there was a net change in file length. */ if (marked_file == window->file_info) { /* * if cursor is before marked block then adjust block by net change. */ if (marked_file->block_br > window->rline) { marked_file->block_br += net_change; marked_file->block_er += net_change; marked_file->dirty = GLOBAL; /* * if cursor is somewhere in marked block don't restore, do redisplay */ } else if (marked_file->block_er >= window->rline) marked_file->dirty = GLOBAL; /* * check for lines of marked block beyond end of file */ if (marked_file->block_br > length) unmark_block( window ); else if (marked_file->block_er > length) { marked_file->block_er = length; marked_file->dirty = GLOBAL; } } } } /* * Name: prepare_block * Class: helper function * Purpose: To prepare a window/file for a block read, move or copy. * Date: June 5, 1991 * Passed: window: pointer to current window * file: pointer to file information. * text_line: pointer to line in file to prepare. * lend: line length. * bc: beginning column of BOX. * Notes: The main complication is that the cursor may be beyond the end * of the current line, in which case extra padding spaces have * to be added before the block operation can take place. * this only occurs in BOX and STREAM operations. * since we are padding a line, do not trim trailing space. */ int prepare_block( WINDOW *window, line_list_ptr ll, int bc ) { register int pad = 0; /* amount of padding to be added */ register int len; assert( bc >= 0 ); assert( bc < MAX_LINE_LENGTH ); assert( ll->len != EOF ); assert( g_status.copied == FALSE ); copy_line( ll ); detab_linebuff( ); len = g_status.line_buff_len; pad = bc - len; if (pad > 0) { /* * insert the padding spaces */ assert( pad >= 0 ); assert( pad < MAX_LINE_LENGTH ); memset( g_status.line_buff+len, ' ', pad ); g_status.line_buff_len += pad; } /* * if mode.inflate_tabs, let's don't entab the line until we get * thru processing this line, e.g. copying, numbering.... */ return( un_copy_line( ll, window, FALSE ) ); } /* * Name: pad_dest_line * Class: helper function * Purpose: To prepare a window/file for a block move or copy. * Date: June 5, 1991 * Passed: window: pointer to current window * dest_file: pointer to file information. * dest_line: pointer to line in file