Pull out card functions from evga-card

card.c

@@ -0,0 +1,57 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <limits.h>
+
+#include "card.h"
+
+/* Read a 16-bit unsigned int from a pci id file */
+unsigned short read_pci_id(char *device_path, char *field)
+{
+	char buf[16];
+	char file_path[PATH_MAX];
+	
+	strcpy(file_path, device_path);
+	strcat(file_path, field);
+	
+	FILE *fp = fopen(file_path, "r");
+	
+	if (fp == NULL)
+		return 0;
+		
+	if (fgets(buf, sizeof(buf), fp) == NULL) {
+		fclose(fp);
+		return 0;
+	}
+	
+	fclose(fp);
+	
+	return (unsigned short)strtoul(buf, NULL, 16);
+}
+
+char *read_nvidia_pci_address(char *device_path)
+{
+	char file_path[PATH_MAX];
+	
+	char *ret = calloc(16 + 1, sizeof(char)); /* assuming pci ids could look as large as 00000000:0C:00.0 */
+	
+	strcpy(file_path, device_path);
+	strcat(file_path, "/name");
+	
+	FILE *fp = fopen(file_path, "r");
+	
+	if (fp == NULL) {
+		free(ret);
+		return NULL;
+	}
+	
+	fscanf(fp, "NVIDIA i2c adapter %*u at %16s", ret);
+	fclose(fp);
+	
+	if (strlen(ret) == 0) {
+		free(ret);
+		return NULL;
+	}
+	
+	return ret;
+}