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

// pratice with fgets() + sscanf() to read in multiple lines into struct
typedef struct {
    char ID[16];
    char SNPs[8];
    char MNPs[8];
    char Insertion[8];
    char Deletion[8];
    char Indels[8];                     
    char SameRef[8];            
    char MissingGT[8];             
    char SNPTransTranv[8];
    char TotalHetHomRatio[8];
    char SNPHetHomRatio[8];
    char MNPHetHomRatio[8];
    char InsertionHetHomRatio[8];
    char DeletionHetHomRatio[8];
    char IndelHetHomRatio[8];
    char InsertDeletionRatio[8];
    char Indel_SNPMNPRatio[8];
} RECORD;

int main (int argc, char *argv[])
{
    char line[256];     //for row read from file
    char name[32];      //1st part (key part) parsed from each line[]
    char str1[8];       //2nd part (value part) parsed from each line[]

    FILE* fPtr = fopen(argv[1], "r");
    RECORD record[12];           //test file only has ~ 70 rows
    static int i = 0;            //initialize counter

    while (fgets(line, 256, fPtr) != NULL) {
        //if (!sscanf(line, "%[^\r\n]", name)) continue;      //skip blank line. This line may have problem???
        
    sscanf(line, "%[^:] : %s", name, str1);    //scan in two parts delimited by ":", 
                                             //in the 2nd part, only take the first part delimited by space
    if (strstr(name, "Sample Name") != NULL)
            strcpy(record[i].ID, name);
    else if (strstr(name, "SNPs") != NULL) 
            strcpy(record[i].SNPs, str1);
    else if (strstr(name, "MNPs") != NULL)
            strcpy(record[i].MNPs, str1);
    else if (strstr(name, "Insertions") != NULL)
            strcpy(record[i].Insertion, str1);
    else if (strstr(line, "Deletions") != NULL)
            strcpy(record[i].Deletion, str1);
    else if (strstr(line, "Indels") != NULL) 
            strcpy(record[i].Indels, str1);
    else if (strstr(line, "Same as reference") != NULL)
            strcpy(record[i].SameRef, str1);
    else if (strstr(line, "Missing Genotype") != NULL)
            strcpy(record[i].MissingGT, str1);
    else if (strstr(line, "SNP Transitions") != NULL)
            strcpy(record[i].SNPTransTranv, str1);
    else if (strstr(line, "Total Het/Hom") != NULL)
            strcpy(record[i].TotalHetHomRatio, str1);
    else if (strstr(line, "SNP Het/Hom ratio") != NULL)
            strcpy(record[i].SNPHetHomRatio, str1);
    else if (strstr(line, "MNP Het/Hom ratio") != NULL)
            strcpy(record[i].MNPHetHomRatio, str1);
    else if (strstr(line, "Insertion Het/Hom ratio") != NULL)
            strcpy(record[i].InsertionHetHomRatio, str1);
    else if (strstr(line, "Deletion Het/Hom ratio") != NULL)
            strcpy(record[i].DeletionHetHomRatio, str1);
    else if (strstr(line, "Indel Het/Hom ratio") != NULL)
            strcpy(record[i].IndelHetHomRatio, str1);
    else if (strstr(line, "Insertion/Deletion ratio") != NULL)
            strcpy(record[i].InsertDeletionRatio, str1);
    else if (strstr(line, "Inde/SNP+MNP ratio") != NULL)
            strcpy(record[i].Indel_SNPMNPRatio, str1);
   
    printf("%s: %s\n", name, str1);         //puts() always adds newline at the end of the string
        //printf("%d\n", i); 
    i++;                                    //increment of record count
    if (i > 8) exit (EXIT_FAILURE);       //truncate the input file, need improved
	}
    fclose(fPtr);
    return 0;
}

./myprog vcfstats.txt

Sample Name: sample1
SNPs                         : 91
MNPs                         : 1
Insertions                   : 5
Deletions                    : 2
Indels                       : 0
Same as reference            : 1
Missing Genotype             : 44
SNP Transitions/Transversions: 1.74
Total Het/Hom ratio          : 2.96
SNP Het/Hom ratio            : 2.79
MNP Het/Hom ratio            : -
Insertion Het/Hom ratio      : 4.00
Deletion Het/Hom ratio       : -
Indel Het/Hom ratio          : -
Insertion/Deletion ratio     : 2.50
Indel/SNP+MNP ratio          : 0.08
Sample Name: sample2
SNPs                         : 73
MNPs                         : 2
Insertions                   : 2
Deletions                    : 3
Indels                       : 0
Same as reference            : 1
Missing Genotype             : 63
SNP Transitions/Transversions: 1.87
Segmentation fault: 11