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Rewrite to C89 standards, preserve compatibility with old x86 machines

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mrkmntal 2026-03-26 22:55:41 -04:00
commit 0d66f50b72
1 changed files with 16 additions and 10 deletions
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26
sccash.c
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@ -24,7 +24,8 @@ const char* currency_names[] = {"USD", "JPY", "EUR"};
Currency parse_currency(const char* input) { Currency parse_currency(const char* input) {
char upper[4] = {0}; char upper[4] = {0};
for (int i = 0; i < 3 && input[i]; i++) { int i;
for (i = 0; i < 3 && input[i]; i++) {
upper[i] = toupper(input[i]); upper[i] = toupper(input[i]);
} }
@ -53,8 +54,9 @@ double convert_from_usd(double usd_amount, Currency to) {
} }
double convert_currency(double amount, Currency from, Currency to) { double convert_currency(double amount, Currency from, Currency to) {
double usd_amount;
if (from == to) return amount; if (from == to) return amount;
double usd_amount = convert_to_usd(amount, from); usd_amount = convert_to_usd(amount, from);
return convert_from_usd(usd_amount, to); return convert_from_usd(usd_amount, to);
} }
@ -73,10 +75,11 @@ void print_table_footer(void) {
} }
void print_all_conversions(double amount, Currency from) { void print_all_conversions(double amount, Currency from) {
int i;
printf("\n"); printf("\n");
print_table_header(); print_table_header();
for (int i = 0; i < 3; i++) { for (i = 0; i < 3; i++) {
if (i != from) { if (i != from) {
Currency to = (Currency)i; Currency to = (Currency)i;
double result = convert_currency(amount, from, to); double result = convert_currency(amount, from, to);
@ -94,7 +97,8 @@ void print_all_conversions(double amount, Currency from) {
void interactive_mode(void) { void interactive_mode(void) {
char from_input[10], to_input[10]; char from_input[10], to_input[10];
double amount; char show_all[10];
double amount, result;
Currency from, to; Currency from, to;
printf("\n=== sccash - Simple C Cash ===\n\n"); printf("\n=== sccash - Simple C Cash ===\n\n");
@ -129,7 +133,7 @@ void interactive_mode(void) {
return; return;
} }
double result = convert_currency(amount, from, to); result = convert_currency(amount, from, to);
printf("\n"); printf("\n");
print_table_header(); print_table_header();
@ -138,7 +142,6 @@ void interactive_mode(void) {
printf("\n"); printf("\n");
printf("Show all conversions? (y/n): "); printf("Show all conversions? (y/n): ");
char show_all[10];
scanf("%9s", show_all); scanf("%9s", show_all);
if (show_all[0] == 'y' || show_all[0] == 'Y') { if (show_all[0] == 'y' || show_all[0] == 'Y') {
print_all_conversions(amount, from); print_all_conversions(amount, from);
@ -146,6 +149,9 @@ void interactive_mode(void) {
} }
void cli_mode(int argc, char* argv[]) { void cli_mode(int argc, char* argv[]) {
double amount, result;
Currency from, to;
if (argc < 4) { if (argc < 4) {
fprintf(stderr, "Usage: %s <amount> <from> <to>\n", argv[0]); fprintf(stderr, "Usage: %s <amount> <from> <to>\n", argv[0]);
fprintf(stderr, " amount: numeric value to convert\n"); fprintf(stderr, " amount: numeric value to convert\n");
@ -156,14 +162,14 @@ void cli_mode(int argc, char* argv[]) {
exit(1); exit(1);
} }
double amount = atof(argv[1]); amount = atof(argv[1]);
if (amount <= 0) { if (amount <= 0) {
fprintf(stderr, "Error: Invalid amount '%s'\n", argv[1]); fprintf(stderr, "Error: Invalid amount '%s'\n", argv[1]);
exit(1); exit(1);
} }
Currency from = parse_currency(argv[2]); from = parse_currency(argv[2]);
Currency to = parse_currency(argv[3]); to = parse_currency(argv[3]);
if (from == CURRENCY_INVALID) { if (from == CURRENCY_INVALID) {
fprintf(stderr, "Error: Invalid source currency '%s'\n", argv[2]); fprintf(stderr, "Error: Invalid source currency '%s'\n", argv[2]);
@ -177,7 +183,7 @@ void cli_mode(int argc, char* argv[]) {
exit(1); exit(1);
} }
double result = convert_currency(amount, from, to); result = convert_currency(amount, from, to);
printf("\n"); printf("\n");
print_table_header(); print_table_header();