到目前为止,我得到了一个汇编程序,用于以 - main: mov %a,0x04 ; sys_write
这样的行开头的作业。有些行包含标签(即末尾带有分号的单词),有些则不包含。;
之后的所有内容都是评论,需要删除。空格需要删除并放回原处,以便成品看起来像这样 - main: mov %a,0x04
.我花了很多天的时间,想知道你们是否知道如何放置空格,因为目前它看起来像这样 - main:mov%a,0x04
.任何普遍添加空格的可靠方法将不胜感激。
int i;
char line[256];
while(fgets(line,256,infile) != NULL)
{
char label[256];
int n = 0;
for( i=0; i<256; i++)
{
if(line[i] == ';') // checks for comments and removes them
{
label[n]=' ';
break;
}
else if(line[i] != ' ' && line[i] != 'n')
{
label[n] = line[i]; // label[n] contains everything except whitespaces and coms
n++;
}
}
char instruction[256];
for(n =0; n<strlen(label);n++)
{
//don't know how to look for commands like mov here
// would like to make an array that puts the spaces back in?
}
// checks if string has characters on it.
int len = strlen(label);
if(len ==0)
continue;
printf("%sn",label);
}
fclose(infile);
return 0;
我将字符串分成空格之间的子字符串,然后在它们之间添加一个空格。
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(){
FILE *infile=fopen("assembly","r");
char line[256];
while(fgets(line,256,infile) != NULL)
{
char* tok=strtok(line,";"); //search for comma
char* label=malloc(strlen(tok)*sizeof(char)); //allocate memory for
//string until comma
strcpy(label,""); //clean string
tok=strtok(tok," "); //search for space
while(tok != NULL){
if(strlen(label)>0) //when not empty,
strcat(label," "); //add space
strcat(label,tok);
tok=strtok(NULL," ");
}
printf("%s_n",label);
free(label);
}
fclose(infile);
return 0;
如果你仍然想以你的方式做,我会这样做
(...)
else if((line[i] != ' ' && line[i] != 'n')||(line[i-1] != ' ' && line[i] == ' '))
{ // also copy first space only
label[n] = line[i]; // label[n] contains everything except whitespaces and coms
n++;
}
}
printf("%sn",label);
}
fclose(infile);
return 0;
}