1 /******************************************************************************
2 * removeLineEndSpace
3 * 声明：
4 * 该程序是之前alignBySpace的逆向补充程序，去掉行尾的空格。
5 *
6 * 2015-8-11 阵雨 深圳 南山平山村 曾剑锋
7 *****************************************************************************/
8 #include <stdio.h>
9 #include <string.h>
10 #include <stdlib.h>
11
12 int main ( int argc, char ** argv ) {
13
14 int ret = 0;
15 char *tempFile = "generateFile.txt";
16 char *readBuffer = NULL;
17 size_t bufferSize = 512;
18 int readBufferIndex = 0;
19
20 if ( argc != 2 ) {
21 printf ( "USAGE:\n" );
22 printf ( " removeLineEndSpace <file>.\n" );
23 return -1;
24 }
25
26 FILE *readfile = fopen ( argv[1], "r" ); // only read
27 FILE *writefile = fopen ( tempFile, "w" ); // only write
28
29 /**
30 * man datasheet:
31 * If *lineptr is NULL, then getline() will allocate a buffer for storing the line,
32 * which should be freed by the user program. (In this case, the value in *n is ignored.)
33 */
34 while ( ( ret = getline( &readBuffer, &bufferSize, readfile ) ) != -1 ) {
35
36 readBufferIndex = ret - 1; // index for real position
37
38 while ( ( readBuffer [ readBufferIndex ] == ' ' ) || // del ' ', '\t', '\n' character
39 ( readBuffer [ readBufferIndex ] == '\n' ) || ( readBuffer [ readBufferIndex ] == '\t' ) )
40 readBuffer [ readBufferIndex-- ] = '\0';
41
42 readBuffer [ readBufferIndex + 1 ] = '\n';
43
44 fputs ( readBuffer, writefile ); // write to file
45
46 bzero ( readBuffer, ret ); // clean buffer
47 }
48
49 free ( readBuffer ); // referrence getline()
50
51 fclose ( readfile );
52 fclose ( writefile );
53
54 remove ( argv[1] ); // delete source file
55 rename ( tempFile, argv[1] ); // tempfile rename to source file
56 }
