absoluteLoader

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

#define Max_Line_Length 100     // Maximum length of each line in the input file
#define Max_Text_Records 10     // Maximum number of text records that can be stored

// Structure to store details of each text record
typedef struct TextRecords {
    int address;                 // Address field of the text record
    int length;                  // Length of the text record
    char restOfLine[Max_Line_Length];  // Remaining part of the line after address and length
} TextRecords;

TextRecords textRecords[Max_Text_Records];  // Array to hold text records
int textRecordCount = 0;                    // Counter for the number of text records stored

int main() {
    char line[Max_Line_Length], restOfLine[Max_Line_Length];
    int address, text_length;

    FILE *f1, *f2;

    // Open input and output files
    f1 = fopen("input.txt", "r");
    f2 = fopen("output.txt", "w");

    // Check if files were opened successfully
    if (f1 == NULL || f2 == NULL) {
        printf("Error! File not found.");
        exit(0);
    }

    // Read each line from the input file
    while (fgets(line, sizeof(line), f1)) {
        // Check if the line starts with 'H' (Header record)
        if (line[0] == 'H') {
            int starting_address, length;
            char name[7];
            // Parse the header record to extract name, starting address, and length
            sscanf(line, "H^%4s^%X^%d", name, &starting_address, &length);
            printf("Starting address is %06X\n", starting_address);
        }
            // Check if the line starts with 'T' (Text record)
        else if (line[0] == 'T') {
            // Parse the text record to extract address, length, and remaining data
            sscanf(line, "T^%X^%X^%[^\n]", &address, &text_length, restOfLine);
            // Store parsed values into the textRecords array
            snprintf(textRecords[textRecordCount].restOfLine, Max_Line_Length, "%s", restOfLine);
            textRecords[textRecordCount].address = address;
            textRecords[textRecordCount].length = text_length;
            textRecordCount++;    // Increment the text record count
        }
            // Check if the line starts with 'E' (End record)
        else if (line[0] == 'E') {
            break;    // End the loop if 'E' record is found
        }
    }

    // Process each stored text record and write to the output file
    for (int i = 0; i < textRecordCount; ++i) {
        // Tokenize the restOfLine string based on the '^' delimiter
        char *token = strtok(textRecords[i].restOfLine, "^");
        while (token != NULL) {
            int len = strlen(token);
            // Write pairs of characters to output file in specific format
            while (len > 0) {
                fprintf(f2, "%06X %c%c\n", textRecords[i].address++, token[0], token[1]);
                len -= 2;         // Move to the next two characters
                token += 2;       // Advance the pointer
            }
            token = strtok(NULL, "^"); // Get the next token
        }
    }

    printf("\n--------Output written to output.txt--------\n");

    // Close input and output files
    fclose(f1);
    fclose(f2);

    return 0;
}


/*
input.txt
-----------------------------------------------------
H^COPY^001000^00001F
T^001000^12^123456^011020^051022^231025^678369^000002
T^001021^12^123456^011020^051022^231025^678369^000002
E^001000
-----------------------------------------------------
*/