LinuxQuestions.org - How to find a particular string occurance position in a file?

I have a program which will write informations like gid,gname,resname,restype,etc... in a file.I wrote a function to get the starting and ending position of a particular group.Stating of a particular group (say group 12)is denoted in a file by #gid12 and the end of the group is denoted by @gid12.I don't know wat mistake i have done. The code works correctly only for the 1st group in the file. when i try to get other groups information i am getting wrong output.Plz tel me wat is the bug in my program.And is there any other way to find the starting and ending position of a particular group from my file.

OUTPUT FILE WILL LOOK AS FOLLOWS:

Quote:

IP_Address:12.12.12.12
#gid1:sdf
Res-info$:;xyz;qww;qasddfasd;2:
Res-info$:;hjuy;asdfv;dfhvhvf;3:
Res-info$:;asdfg;eretg;wedsfh;7:
@gid1
IP_Address:123.12.132.12
#gid2:dfc
Res-info$:;hjuy;asdfv;dfhvhvf;3:
Res-info$:;asdfg;eretg;wedsfh;7:
@gid2
IP_Address:121.121.112.12
#gid12:xsdf
Res-info$:;xyz;qww;qasddfasd;2:
Res-info$:;asdfg;eretg;wedsfh;7:
@gid12

I have given the code below.Is there any other way to get the starting and ending position of a particular group from my file?? kindly help me on this

Code:



#include<stdio.h>

#include<stdlib.h>

#include<string.h>

#include<stdlib.h>

#define MAX 10

#define LINESIZE 256



struct resource

{

char res_type[12];

char res_name[25];

char res_loc[30];

int res_pri;

}res[MAX];

int store(char *ip_add,int g_id,char *g_name,struct resource res[],int n);



int FindStr(FILE *f, char *str);



main()

{

int g_id,i=0,choice,nor,j,status,gi=0,st=0,en=0;

char *g_name,*ip_add;

FILE *fp;







g_name=(char *)malloc(sizeof(char) * (MAX+1));

ip_add=(char *)malloc(sizeof(char) * (16));

printf("\nEnter the Following Data...\n");

printf("\nEnter Node IP Address:");

scanf("%s",ip_add);

printf("Enter g_id:");

scanf("%d",&g_id);

printf("Enter g_name:");

scanf("%s",g_name);

printf("Enter the resources...\n");



do

{

printf("Enter %d res_type:",i+1);

scanf("%s",res[i].res_type);



printf("Enter %d res_name:",i+1);

scanf("%s",res[i].res_name);



printf("Enter %d res_location:",i+1);

scanf("%s",res[i].res_loc);



printf("Enter %d res_priority:",i+1);

scanf("%d",&res[i].res_pri);





printf("\nDo u want to add another resource?\n 1.Yes\n2.N0\n:");

scanf("%d",&choice);



i++;

}while(choice==1);

nor=i-1;

j=0;





status=store(ip_add,g_id,g_name,res,nor);

if(status==0)

printf("\nfile updated successfully...\n");

else

printf("\nUpdate failed...\n");



 const char sbase[] = "#gid";

 const char ebase[] = "@gid";

 char start [10],end[10];

 //read the group id to be fetched

 printf("Enter the Group id to be fetched:");

 scanf("%d",&gi) ;

 sprintf(start, "%s%d", sbase, gi);

 printf("start = \"%s\"\n", start);

 sprintf(end, "%s%d", ebase, gi);

 printf("end = \"%s\"\n", end);

 fp=fopen("config.ini","r");



 st=FindStr(fp, start);

 en=FindStr(fp, end);

 printf("\nStart position:%d",st);

 printf("\nEnd position:%d",en);









}





struct group

{

char ip_add[25];

int g_id;

char g_name[25];

struct resource res[];

}g;



int store(char *ip_add,int g_id,char *g_name,struct resource res[],int n)

{

FILE *fp;

int i=0,j=0;

//ip_add=(char *)malloc(sizeof(char) * (MAX+1));

fp=fopen("config.ini","a");

if (fp==NULL)

{

printf("cannot open file");

return 1;

}

else

{

strcpy(g.ip_add,ip_add);

g.g_id=g_id;

strcpy(g.g_name,g_name);



while(i<=n)

{

//g.res[i].res_type=res[i].res_type;

strcpy(g.res[i].res_type,res[i].res_type);

strcpy(g.res[i].res_name,res[i].res_name);

strcpy(g.res[i].res_loc,res[i].res_loc);

g.res[i].res_pri=res[i].res_pri;

i++;

}







fprintf(fp,"\nIP_Address:%s",g.ip_add);

fprintf(fp,"\n#gid%d:",g.g_id);

fprintf(fp,"%s",g.g_name);



while(j<=n)

{

fprintf(fp,"\nRes-info$:;");

fprintf(fp,"%s;",g.res[j].res_type);

fprintf(fp,"%s;",g.res[j].res_name);

fprintf(fp,"%s;",g.res[j].res_loc);

fprintf(fp,"%d:",g.res[j].res_pri);

j++;

}

fprintf(fp,"\n@gid%d",g.g_id);

fclose(fp);

return 0;

}





}





int FindStr(FILE *f, char *str)

{

 int s_pos; //string position in the text

 int c_pos; //char position in the text

 char *string;

 char ccnt; //char count

 

 s_pos = -1;

 c_pos = 0;

 string = malloc(strlen(str));

 while (!feof(f))

  {

  if (c_pos == 0)

    for (ccnt = 1; ccnt <= strlen(str); ccnt++)

    if (!feof(f))

      string[ccnt - 1] = getc(f);



  if (c_pos != 0)

    if (!feof(f))

    {

      for (ccnt = 0; ccnt <= strlen(str) - 2; ccnt++)

      string[ccnt] = string[ccnt + 1]; 

      string[strlen(str) - 1] = getc(f);

    }  

  if (strcmp(string, str) == 0)

    {

    s_pos = c_pos;

    break;

    }  

  c_pos++;

  }

 return(s_pos);

}