initial commit

.editorconfig

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+[*]
+tab_width = 8;
+indent_style = tabs;

Makefile

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+TARGET=pinmon
+CC=gcc
+CFLAGS=-Wall
+LDFLAGS=-lwiringPi
+
+SRC=$(wildcard *.c)
+OBJ=$(SRC:.c=.o)
+
+all: $(TARGET)
+
+$(TARGET): $(OBJ)
+	$(CC) $(CFLAGS) $(LDFLAGS) $(OBJ) -o $(TARGET)
+
+clean:
+	rm -f $(TARGET) *.o
+
+%.o: %.c
+	$(CC) $(CFLAGS) -c $< -o $@

README.org

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+* pinmon
+
+** requirements
+
+you need [[https://github.com/WiringPi/WiringPi][WiringPi]].
+download the latest source release and compile it, or install it using your operating system's package manager.
+
+** usage
+
+run with no arguments: print everything
+
+pass a single integer argument from 1-31 to read a single pin
+
+** todo
+
+output formatting options (implemented, but not accessible)

main.c

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+#include <stdio.h>
+#include <stdlib.h>
+
+#include <wiringPi.h>
+
+void get_one(int *a, int p) {
+	a[p] = digitalRead(p);
+	return;
+}
+
+void get_all(int *a) {
+	for (int i = 1; i < 32; i++) {
+		a[i] = digitalRead(i);
+	}
+        return;
+}
+
+void print_all_quiet(int *a) {
+	for (int i = 1; i <= 31; i++) {
+		if (i % 10) {
+			printf("%d ", a[i]);
+		} else if (i == 30) {
+			printf("%d ", a[i]);
+                } else {
+                  putchar('\n');
+                }
+        }
+}
+
+void print_all_oneline(int *a) {
+	for (int i = 1; i <= 31; i++)
+		printf("%d ", a[i]);
+
+	putchar('\n');
+}
+
+int main(int argc, char *argv[]) {
+	/*
+	 * pins[] array: GPIO pins only, input only; using WiringPi num scheme
+	 * 0: placeholder
+	 * 1-31: WiringPi 1-31
+	*/
+	int pins[31];
+	int pin;
+
+	wiringPiSetupPinType(WPI_PIN_WPI);
+	//printf("%i\n", argc);
+
+        switch (argc) {
+        case 1: // print everything
+		get_all(pins);
+		printf("Pins 1-10:\n\t");
+                for (int i = 1; i <= 10; i++) {
+			printf("%d ", pins[i]);
+                }
+		printf("\nPins 11-20:\n\t");
+                for (int i = 11; i <= 20; i++) {
+			printf("%d ", pins[i]);
+                }
+		printf("\nPins 21-30:\n\t");
+                for (int i = 21; i <= 30; i++) {
+			printf("%d ", pins[i]);
+                }
+                putchar('\n');
+                break;
+	case 2: // print 1 pin
+		pin = atoi(argv[1]);
+                if ((pin >= 1) && (pin <= 31)) {
+			get_one(pins, pin);
+			printf("%d\n", pins[pin]);
+                }
+                break;
+	default: // no
+		fprintf(stderr, "err: too many args (%d)\n", argc-1);
+		return EXIT_FAILURE;
+		break;
+        }
+
+	return EXIT_SUCCESS;
+}