C - how to delete string the same string as user input from a file in c?

debugcn Published at Dev

Gio

I want to make a program that delete a String that the same as user input from a file below are contents in the file

G12
G13
G14

For example user input G13 , expected output is as following :

G12
G14

I got some idea that make a temporary file , but don't get any idea on how to get a string line by line because i print the file content using these code

if(file!=NULL)
{
    while ((c = getc(file)) != EOF)
    putchar(c);
    fclose(file);
}

so basically i reads all the file content only letter by letter (dont have any idea how to make it reads word by word

Thanks in advance

BLUEPIXY

simple line by line sample

#include <stdio.h>
#include <string.h>

char *esc_cnv(char *str){
    char *in, *out;
    out = in = str;
    while(*in){
        if(*in == '\\' && in[1] == 'n'){
            *out++ = '\n';
            in += 2;
        } else 
            *out++ = *in++;
    }
    *out = '\0';
    return str;
}

int main(void){
    FILE *fin = stdin, *fout = stdout;
    char line[1024];
    char del_str[1024];
    char *p, *s;
    int len;
    int find=0;//this flag indicating whether or not there is a string that you specify 

    fin = fopen("input.txt", "r");
    fout = fopen("output.txt", "w");//temp file ->(delete input file) -> rename temp file.
    printf("input delete string :");
    scanf("%1023[^\n]", del_str);
    esc_cnv(del_str);//"\\n" -> "\n"
    len = strlen(del_str);
    while(fgets(line, sizeof(line), fin)){
        s = line;
        while(p = strstr(s, del_str)){
            find = 1;//find it!
            *p = '\0';
            fprintf(fout, "%s", s);
            s += len;
        }
        fprintf(fout, "%s", s);
    }
    fclose(fout);
    fclose(fin);
    if(find==0)
        fprintf(stderr, "%s is not in the file\n", del_str); 
    return 0;
}

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