nah it was ass

include/utils.h

@@ -1,9 +1,11 @@
 #ifndef UTILS_H
 #define UTILS_H
 
-#define fastReadNum(path, buf, result_ptr, div)     \
-_Generic((result_ptr),                      \
-uint64_t*: _fRN_u64,                \
-)(path, buf, sizeof(buf), result_ptr, div)
+void fast_read_num_u64(const char* dir, const char* file, char* buf, uint64_t* result, uint16_t divider);
+void fast_read_num_i16(const char* dir, const char* file, char* buf, int16_t* result, uint16_t divider);
+
+bool file_exists(const char *path);
+
+int get_hwmon_dir(char *path);
 
 #endif

src/utils.c

@@ -2,20 +2,31 @@
 #include <stdint.h>
 #include <stdlib.h>
 #include <unistd.h>
-#include "log.h"
 #include <glob.h>
+#include <string.h>
 
+#include "log.h"
 #include "utils.h"
 
+#define MKPATH(path, dir, file) do {char *nt = stpcpy(path, dir); *nt++ = '/'; stpcpy(nt, file); } while (0)
+
 inline bool file_exists(const char* path) {
 	return access(path, F_OK) == 0;
 }
 
+/* path has to have at least 8 free chars at the end for glob */
 int get_hwmon_dir(char* path) {
 	glob_t g;
-	if (glob(path, 0, NULL, &g) == 0) {
+	// const size_t len = strlen(path);
+	// strcpy(&path[len], "/hwmon*"); // append the glob to the end of the path
+	strncat(path, "/hwmon*", 8);
 
+	if (glob(path, 0, nullptr, &g) == 0) {
+		strncpy(path, g.gl_pathv[0], 256);
+		globfree(&g);
+		return 0;
 	}
+	return -1;
 }
 
 /* read n bytes from path into buffer */
@@ -31,7 +42,16 @@ inline ssize_t read_file(const char* path, char* buffer, const ssize_t n) {
 	return len;
 }
 
-inline void _fRN_u64(const char* path, char* buf, uint64_t* result, const uint16_t divider) {
-	read_file(path, buf, 24); // wont ever be longer than 24 chars right? potential bug
-	*result = strtoull(buf, NULL, 10) / divider;
+inline void fast_read_num_u64(const char* dir, const char* file, char* buf, uint64_t* result, const uint16_t divider) {
+	char path[256];
+	MKPATH(path, dir, file);
+	read_file(path, buf, 32);
+	*result = strtoull(buf, nullptr, 10) / divider;
+}
+
+inline void fast_read_num_i16(const char* dir, const char* file, char* buf, int16_t* result, const uint16_t divider) {
+	char path[256];
+	MKPATH(path, dir, file);
+	read_file(path, buf, 32);
+	*result = strtol(buf, nullptr, 10) / divider;
 }