likefindΒΆ

likefind.c

#include<stdio.h>
#include<string.h>
#define MAXLINE 1000

int getline(char *line,int max);

/* find: print lines that match pattern from the 1st arg
        ----------------------------
            find -nx pattern
        ----------------------------        
*/

int main(int argc,char *argv[])
{
    char line[MAXLINE];
    long lineno = 0;
    int c,except =0,number =0,found =0;

    while(--argc > 0 && (*++argv)[0] == '-')
        while(c = *++argv[0])
            switch(c)
            {
                case 'x':
                    except =1;
                    break;
                case 'n':
                    number =1;  
                    break;
                default:
                    printf("find: illegal option %c\n",c);
                    argc =0;
                    found = -1;
                    break;
            }
    if(argc != 1)
        printf("Usage: find -x -n pattern \n");
    else
        while(getline(line,MAXLINE) >0)
        {
            lineno++;
            if((strstr(line,*argv)!=NULL) != except)
            {
                if(number)
                    printf("%ld:",lineno);
                printf("%s",line);
                found++;
            }
        }
    return found;
}

int getline(char *s,int lim)
{
    int c;
    char *t=s;

    while(--lim > 0 && (c=getchar())!=EOF && c!='\n')
        *s++ =c;
    
    if(c=='\n')
        *s++=c;
    *s ='\0';

    return s -t;
}
 
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