弄了几篇英语文章,想要在Linux下阅读,可是发现没有换行,每一段都是从左到右一整行,于是写下这个小工具,实现自动换行:

#include <stdio.h>

#include <stdlib.h>

#include <string.h>



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

	FILE *fp_in = 0;

	FILE *fp_out = 0;

	char str[1024]={0};

	char file_out[512]={0};

	int len = 0;

	int i = -1;

	int mark = 0;

	char *file_name = 0;

	int file_width = 0;



	if(argc<3){

		printf(" textwidth <filename> <width>\n");

	}



	file_name = argv[1];

	file_width = atoi(argv[2]);

	sprintf(file_out, "w%d_%s", file_width, file_name);



	fp_in = fopen(file_name, "r");

	fp_out = fopen(file_out, "w");

	str[++i] = ' ';

	str[++i] = ' ';

	while(str[++i] = fgetc(fp_in)){

		mark = 0;

		if( i>=1023){

			mark = -1;

		}

		if(str[i] == '\n' ){

			mark=-2;

		}

		if(str[i] == ' ' && i>file_width){

			str[++i] = '\n';

			mark=-1;

		}

		if(str[i] == EOF){

			str[i] = '\n';

			mark = -3;

		}



		if(mark<0){

			str[++i] = 0;

			i=-1;

			fprintf( fp_out, " %s", str);

		}

		if(mark == -2){

			str[++i] = ' ';

			str[++i] = ' ';	

		}

		if(mark == -3){

			break;

		}



	}



	fclose(fp_in);

	fclose(fp_out);

	

	printf(" Create file %s from %s as width %d\n", file_out, file_name, file_width);

	

}