Scan a file to search pre-defined c keywords and print them on console -

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how can scan file word , print line containing word in c programming?

i trying find way scan file keyword , print line containing word. off rough start. here have:

#include <stdio.h>  void getdsk (void);  void getdsk () { file* fp; char result [1000]; fp = popen("diskutil list","r"); fread(result,1,sizeof(result),fp); fclose (fp);  while(!feof(fp)) {         if(//line contains "test".)         {             //show line.         }     } }  int main(int argc, const char * argv[]) {     getdsk();     return 0; }

edit: did needed.

#include <stdio.h>  void getdsk (void);  void getdsk () {     printf("your available windows installations are:\n");     file* fp = popen("diskutil list","r");     char line[1024];     while(fgets(line, sizeof(line), fp))      {         if (strstr(line,"microsoft"))          {             printf("%s", line);         }         // if line contains text, print     } }  int main(int argc, const char * argv[]) {     getdsk();     return 0; }

a few things:

1) should pretty never write while(!feof(fp)) { ... } broken pattern because feof return true after read attempt. open off 1 errors.

2) why heck doing this?

fp = popen("diskutil list","r"); fread(result,1,sizeof(result),fp); fclose (fp);

you reading 1000 chars of file closing it, later stub code acts if plans on reading file more... makes no sense.

3) here's reasonable approach:

char line[1024]; while(fgets(line, sizeof(line), fp)) {     // if line contains text, print }

what going on here fgets read line , return non-null if succeeds. (null treated "false", non-null "true" when used in test).

so saying "while read line, following", want. also, making assumption no lines exceed 1024 characters reasonable assumption, if not case, need adjust accordingly.


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