1 /******************************************************************* 2 * 空格填充器(alignBySpace) 3 * 声明： 4 * 1. 软件主要是在不改变文本文件内容情况下，自动填充空格一定数量的 5 * 空格，达到空格右对齐的功能； 6 * 2. 本软件主要是节省个人的代码跟踪文档打空格的时间； 7 * 8 * 2015-8-3 晴 深圳 南山平山村 曾剑锋 9 ******************************************************************/ 10 #include <stdio.h> 11 #include <string.h> 12 #include <stdlib.h> 13 14 int main ( int argc, char ** argv ) { 15 16 int ret = 0; 17 int column = 0; 18 char *tempFile = "generateFile.txt"; 19 char *readBuffer = NULL; 20 size_t bufferSize = 512; 21 int readBufferIndex = 0; 22 int writeBufferIndex = 0; 23 char writeBuffer[bufferSize]; 24 25 if ( ( argc < 2 ) || ( argc > 3 ) ) { 26 printf ( "USAGE: " ); 27 printf ( " alignBySpace <file> [column]. " ); 28 return -1; 29 } 30 31 if ( argc == 2 ) { 32 printf ( " Use default columns: 80. " ); 33 column = 80; 34 } else 35 column = atoi ( argv[2] ); 36 37 FILE *readfile = fopen ( argv[1], "r" ); // only read 38 FILE *writefile = fopen ( tempFile, "w" ); // only write 39 40 /** 41 * man datasheet: 42 * If *lineptr is NULL, then getline() will allocate a buffer for storing the line, 43 * which should be freed by the user program. (In this case, the value in *n is ignored.) 44 */ 45 while ( ( ret = getline( &readBuffer, &bufferSize, readfile ) ) != -1 ) { 46 47 readBufferIndex = 0; 48 writeBufferIndex = 0; 49 50 while ( readBufferIndex < ret ) { 51 if ( readBuffer [ readBufferIndex ] != ' ' ) // kick out ' ' 52 writeBuffer [ writeBufferIndex++ ] = readBuffer [ readBufferIndex++ ]; 53 else { 54 memset ( writeBuffer + writeBufferIndex, ' ', 4 ); // every tab key was 4 space 55 writeBufferIndex += 4; 56 readBufferIndex++; 57 } 58 } 59 60 writeBufferIndex--; // back to real index 61 62 if ( ( column - writeBufferIndex ) > 0 ) { // may be real column longer than we set 63 // ' ' at end of a line, need to kick it out 64 memset ( writeBuffer + writeBufferIndex, ' ', column - writeBufferIndex ); 65 writeBuffer [ column ] = ' '; // for end of a line 66 writeBuffer [ column + 1 ] = ' '; // for end of a string 67 } else 68 writeBuffer [ writeBufferIndex + 1 ] = ' '; // make sure end of a string 69 70 fputs ( writeBuffer, writefile ); // write to file 71 72 bzero ( readBuffer, bufferSize ); // clean buffer 73 bzero ( writeBuffer, bufferSize ); 74 75 } 76 77 free ( readBuffer ); // referrence getline() 78 79 fclose ( readfile ); 80 fclose ( writefile ); 81 82 remove ( argv[1] ); // delete source file 83 rename ( tempFile, argv[1] ); // tempfile rename to source file 84 }