single character replace program 文本中单个字符的替换，支持一些特殊的字符。

文本中单个字符的替换，支持一些特殊的字符。

用法：

sreplace /b file character1 character2

作用：

将file中的character1全部替换成character2。

说明：

开关 /b 表明备份文件，这时可选项。

character1、character2可以为特殊字符，特殊的字符以 ^ 开头，

^n 表示回车换行符；

^t 表示制表符；

^^ 表示^本身；

^* 表示*。

支持 /? 选项。

源程序：

EXE文件：

dev c++ 4.9.9.2 通过编译。


#include <stdio.h>


#include <stdlib.h>




static void usage(void);




int main(int argc, char *argv[])




...{


int i, c[3];




/**//* two swtiches flag */


int backupfile = 0, question = 0;


FILE *sourcefile, *objfile;


char tmpname[256];


char bakname[256];






/**//* peocess the switches '/', stop when the first charecter is not '/' */


i = 1;


while(i < argc)




...{


if(argv[i][0] == '/')




...{


switch(argv[i][1])




...{


case 'b': backupfile = 1; break;


case '?': question = 1; break;


default: break;


}


}


else


break;




i++;


}






/**//* ask usage or the arguments's number is not correct */


if(question == 1)




...{


usage();


getch();


exit(0);


}


else if( argc - i != 3 )




...{


puts("bad arguments, please type /? for help");


getch();


exit(1);


}






/**//* we know, the impotant three arguments's positions as follow:


argc-3 is the position of filename;


argc-2 is the position of charecter which will be replace;


argc-1 is the position of new charecter; */




sourcefile = fopen(argv[argc-3], "r");


if(sourcefile == NULL)




...{


printf("can not open file %s", argv[argc-3]);


getch();


exit(1);


}






/**//* get a file name randomly */


tmpnam(tmpname);


objfile = fopen(tmpname, "w");






/**//* get the replace charecters */


c[1] = argv[argc-2][0];


c[2] = argv[argc-1][0];






/**//* process the speacial charecter */


i = 1;


while(i < 3)




...{


if(c[i] == '^')




...{


switch(argv[argc-3+i][1])




...{


case 'n': c[i] = ' '; break;


case 't': c[i] = ' '; break;


case '^': c[i] = '^'; break;


case '*': c[i] = '*'; break;


default : break;


}


}


i++;


}






/**//* replace the charecter */


while( (c[0] = fgetc(sourcefile)) != EOF )


c[0] == c[1] ? fputc(c[2], objfile):fputc(c[0], objfile);






fclose(sourcefile);


fclose(objfile);






/**//* change the file name */


if(backupfile == 1)


rename(argv[argc-3], strcat(strcpy(bakname, argv[argc-3]), ".bak"));


else


remove(argv[argc-3]);


rename(tmpname, argv[argc-3]);




return 0;


}




static void usage(void)




...{


puts("sreplace /b filename char1 char2 ");


puts("use char2 to replace with char1 in filename.");


puts("/b: tell program to backup the file.");


puts("special characters are supported by char1 and char2,");


puts("and they begin with ^, as follows:");


puts("^n: CR/LF, ^t: table, ^*: *, ^^: ^.");


}