Lab15

.gitignore

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+*.o
+/calc

main.c

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+// main.c
+#include <stdio.h>
+#include <string.h>
+#include "my_fscanf.h"
+int main() {
+	FILE* fp = fopen("points.txt", "r");
+	char type[10];
+	double x, y;
+	int line;
+	if (fp != NULL) {
+		my_fscanf(fp, "%d", &line);
+		for (int i = 0; i < line; i++) {
+			my_fscanf(fp, "%s (%f,%f)", type, &x, &y);
+			if (strcmp(type, "point") == 0) {
+				printf("X: %f:, Y: %f\n", x, y);
+			}
+		}
+	}
+	return 0;
+}

my_fscanf.c

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+// file: my_fscanf.c
+#include "my_fscanf.h"
+#include <stdarg.h>
+#include <ctype.h>
+void my_fscanf(FILE *fp, const char *format, ...) {
+	va_list list;
+	va_start(list, format);
+	while (*format) {
+		if (*format == '%') {		
+			int c;
+			format++;
+			switch (*format) {
+			case 'd':
+			{
+				while (isspace(c = getc(fp))) {}
+
+				int* addr = va_arg(list, int*);
+				*addr = 0;
+				while (isdigit(c)) {
+					*addr = *addr * 10 + c - '0';
+					c = getc(fp);
+				}
+
+				while (isspace(c = getc(fp))) {}
+
+				format++;
+				ungetc(c, fp);
+				break;
+			}
+			case 'c':
+			{
+				while (isspace(c = getc(fp))) {}
+
+				char* addr = va_arg(list, char*);
+				*addr = c;
+				format++;
+				break;
+			}
+			case 's':
+			{
+				char* addr = va_arg(list, char*);
+				int cnt = 1;
+				while (isspace(c = getc(fp))) {}
+
+				addr[0] = c;
+
+				while (!isspace(c = getc(fp))) {
+					addr[cnt] = c;
+					cnt++;
+				}
+				addr[cnt] = 0; //add null char
+				format++;
+				ungetc(c, fp);
+				break;
+			}
+			case 'f':
+			{
+				double* addr = va_arg(list, double*);
+				double decimalFraction = 0.1;
+
+				while (isspace(c = getc(fp))) {}
+				*addr = 0;
+				while (isdigit(c)) {
+					*addr = *addr * 10 + c - '0';
+					c = getc(fp);
+				}
+
+				if (c == '.') {
+					c = getc(fp);
+					while (isdigit(c)) {
+						*addr = *addr + (c - '0') * decimalFraction;
+						decimalFraction *= 0.1;
+						c = getc(fp);
+					}
+				}
+				format++;
+				ungetc(c, fp);
+				break;
+			}
+
+			}
+
+		}
+		else {
+			int c = getc(fp);
+			if (*format == c)
+				format++;
+		}
+	}
+	va_end(list);
+}

my_fscanf.h

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+// file: my_fscanf.h
+#ifndef MY_FSCANF_H
+#define MY_FSCANF_H
+#include <stdio.h>
+void my_fscanf(FILE *fp, const char *format, ...);
+#endif /* !MY_FSCANF_H */

points.txt

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+4
+point (1.3,2.2)
+point (2.5,3.0)
+point (3.2,4.4)
+point (1.0,5.9)