c - fgets function returning wrong value -
my file has first line below:
axx00.data but when call below function, stores xx00.data in ll
fgets(ll,10,keysfile); why weird thing happening? kindly check code below. whole code confuse that's why didn't keep before, remove confusion editing question code.
.... putting complete code on request.....
#include <stdio.h> #include <string.h> #include <stdlib.h> #include <unistd.h> int n=192; int l=8; int s[192]; int i,j; int k[8]; int x,y; int keycounter[192]; int fmsattack(int,int,int,int,int, int); int fms(char[], int); int max(int[]); /*void ksa(int *, int); ksa(int *s,int n) { i,j; for(i=0;i<b+3;i++) { } }*/ int main() { int i,j,b=0,nextkey; for(b=0; b<5;b++)//(l-3);b++) { /*int scurr[n]; (int = 0; < n; i++) { scurr[i]=s[i]; }*/ for(i = 0;i<= 4; i++) { (j = 0; j <= 9; j++) { if(i==0 && j==9) continue; char filename[10]="axx"; char append[10]; sprintf(append, "%d", i); strcat(filename,append); sprintf(append, "%d", j); strcat(filename,append); strcat(filename,".data"); //printf("%s\n", filename); nextkey=fms(filename,b); } } k[b+3]=nextkey; //ksa(scurr[],n); } } int fms(char filename[], int b) { int f; file *outfile; file *infile; file *keysfile; char outfilename[]="out"; char line[20];; char firstline[20]; char *firstlineargs; char ll[10]; int tuples; int count=0; int nextkey; int max; strcat(outfilename,filename); infile=fopen(filename,"r"); //printf("%fopen\n",fopen("keysfile.data","r") ); if(access( "keysfile.data",f_ok ) != -1 ) { printf("a\n"); keysfile=fopen("keysfile.data","a"); } else { printf("w\n"); keysfile=fopen("keysfile.data","w"); } fprintf(keysfile, "%s ",filename); fgets(firstline,20,infile); //printf("firstline=%s\n",firstline); l=atoi(strtok(firstline," ")); tuples=atoi(strtok(null," ")); //printf("%d",l); //printf("%d",tuples); fgets(firstline,20,infile);// skip unnecessary line for(f=0;f<n;f++) keycounter[f]=0; (f=0;f<tuples;f++) { int k0,k1,k2,r; char *lineargs; fgets(line,20,infile); //printf("%s\n",line); //printf("%s\n",strtok(line," ")); k0=atoi(strtok(line," ")); k1=atoi(strtok(null," ")); k2=atoi(strtok(null," ")); r=atoi(strtok(null," ")); if(fmsattack(k0,k1,k2,r,l,b)==1) { count++; nextkey=r-j-s[b+3]; if(nextkey<0) nextkey=nextkey+n; else if(nextkey>(n-1)) nextkey=nextkey-n; keycounter[nextkey]++; //fprintf(outfile, "%d %d %d %d k[b+3]=%d\n", k0,k1,k2,r,nextkey); // printf("%d nextkey=%d\n",count,nextkey); } } max=max(keycounter); { //printf("ll=%s\n",ll ); fgets(ll,11,keysfile); printf("ll=%s filename=%s\n",ll,filename ); if(strncmp(ll,filename,8)>0) break; } while(fgets != '\0'); printf("pratik\n"); fprintf(keysfile, " %d\n",max); printf("pratik\n"); fclose(infile); fclose(outfile); fclose(keysfile); printf("pratik\n"); return max; } int fmsattack(int k0,int k1,int k2,int r,int l, int b) { //ksa // assigning initial values k[0]=k0; k[1]=k1; k[2]=k2; //initialization (i = 0; < n; i++) { s[i]=i; } j=0; //scrambling (i=0; i<b+3; i++) { int temp; j=(j+s[i]+k[i % l]) % n; //swap s[i] & s[j] temp=s[i]; s[i]=s[j]; s[j]=temp; } x=s[1]; y=s[x]; if(x+y==b+3) return 1; else return 0; /* //prga //initilization i=0; j=0; //generation loop for(i=0,j=0;i<3;i++) { i=i+1; j=j+s[i]; x=s[i]; y=s[x]; if(x+y==b+3) return 1; } return 0;*/ } int max(int keycounter[]) { int i,max=0,totalcount=0; for(i=1;i<n;i++) { totalcount=totalcount+keycounter[i]; if(keycounter[i]>keycounter[max]) max=i; } printf("max=%d total=%d per=%d\n",keycounter[max],totalcount,keycounter[max]*100/totalcount ); //if(keycounter[max]*100/totalcount>20) return max; //else // return -1; }
at least fgets() usage wrong.
char ll[10]; ... { // .....v...... wrong size fgets(ll, 11, keysfile); printf("ll=%s filename=%s\n", ll, filename); // 8 , > here questionable too. if (strncmp(ll, filename, 8) > 0) break; } while (fgets != '\0'); // ....^...... not call fgets suggest following
char ll[12]; ... while (fgets(ll, sizeof ll, keysfile) != null) { printf("ll='%s' filename='%s'\n", ll, filename); if (strncmp(ll, filename, 8) > 0) break; }
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