102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
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#include <stdio.h>
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#include <inttypes.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <time.h>
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char intToHex(uint8_t v)
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{
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if (v < 10) return '0' + v;
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else if (v < 16) return 'A' + v - 10;
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else return '-';
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}
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void generateSentence(bool goodCRC)
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{
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uint8_t crc = 0;
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putchar('$');
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/* generate the id */
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for (int i = 0; i < 5; i++) {
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char letter = 'A' + random() % 26;
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putchar(letter);
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crc ^= letter;
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}
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int numberOfArgs = random() % 10;
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for (int i = 0; i < numberOfArgs; i++) {
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putchar(',');
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crc ^= ',';
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int kind = random() % 5;
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switch (kind) {
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case 0: /* integer */
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for (int j = 0; j < random() % 5 + 1; j++) {
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char digit = '0' + random() % 10;
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putchar(digit);
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crc ^= digit;
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}
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break;
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case 1: /* char */
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if (1) {
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char letter = 'A' + random() % 26;
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putchar(letter);
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crc ^= letter;
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}
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break;
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case 2: /* string */
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for (int i = 0; i < 5; i++) {
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char letter = 'A' + random() % 26;
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putchar(letter);
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crc ^= letter;
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}
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break;
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case 3: /* float */
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for (int j = 0; j < random() % 5 + 1; j++) {
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char digit = '0' + random() % 10;
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putchar(digit);
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crc ^= digit;
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}
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putchar('.');
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crc ^= '.';
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for (int j = 0; j < random() % 5 + 1; j++) {
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char digit = '0' + random() % 10;
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putchar(digit);
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crc ^= digit;
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}
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case 4: /* nothing */
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break;
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}
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}
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if (! goodCRC) crc = ~crc;
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putchar('*');
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putchar(intToHex(crc >> 4));
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putchar(intToHex(crc & 0x0F));
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putchar('\r');
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putchar('\n');
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}
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int main(int argc, char *argv[])
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{
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if (argc < 2 || argc > 3) {
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printf("Usage: nmeagen <n> [<c>] where <n> is the number of sentences\n"
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" and <c> the number of sentences with a wrong CRC\n");
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exit(1);
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}
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else {
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int numberOfSentences = strtol(argv[1], NULL, 0);
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int numberOfWrongCRCSentences = 0;
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if (argc == 3) {
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numberOfWrongCRCSentences = strtol(argv[2], NULL, 0);
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}
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/* Init a the random seed with the epoch */
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srandom(time(NULL));
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for (int i = 0; i < numberOfSentences; i++) {
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generateSentence(true);
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}
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for (int i = 0; i < numberOfWrongCRCSentences; i++) {
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generateSentence(false);
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}
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}
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}
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