api versioning for modules

mod.h

@@ -4,10 +4,18 @@
 #include "semver.h"
 #include <stdint.h>
 
+static const semver API_VERSION = {
+    .major = 0,
+    .minor = 1,
+    .patch = 0,
+};
+
+static const uint8_t MFERR_APIVER = 1;
+
 semver version(void);
 const char *name(void);
 
-void init(char **config);
+uint8_t init(char **config);
 const char *get(void);
 
 #endif // _MODFETCH_MOD_H

modules/desktop.c

@@ -8,6 +8,12 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+static const semver api_ver = {
+    .major = 0,
+    .minor = 1,
+    .patch = 0,
+};
+
 static const semver _version = {
     .major = 0,
     .minor = 1,
@@ -17,8 +23,14 @@ static const semver _version = {
 semver version(void) { return _version; }
 const char *name(void) { return "desktop"; }
 
-void init(char **config) {
+uint8_t init(char **config) {
+    if (!sveq(api_ver, API_VERSION)) {
+        return MFERR_APIVER;
+    }
+
     (void)config;
+
+    return 0;
 }
 
 const char *get(void) {

modules/os.c

@@ -10,6 +10,12 @@
 #include <string.h>
 #include <sys/types.h>
 
+static const semver api_ver = {
+    .major = 0,
+    .minor = 1,
+    .patch = 0,
+};
+
 static const semver _version = {
     .major = 0,
     .minor = 1,
@@ -19,8 +25,14 @@ static const semver _version = {
 semver version(void) { return _version; }
 const char *name(void) { return "os"; }
 
-void init(char **config) {
+uint8_t init(char **config) {
+    if (!sveq(api_ver, API_VERSION)) {
+        return MFERR_APIVER;
+    }
+
     (void)config;
+
+    return 0;
 }
 
 const char *get(void) {

modules/sep.c

@@ -12,6 +12,12 @@
 #include <string.h>
 #include <stdlib.h>
 
+static const semver api_ver = {
+    .major = 0,
+    .minor = 1,
+    .patch = 0,
+};
+
 static const semver _version = {
     .major = 1,
     .minor = 0,
@@ -25,7 +31,11 @@ static size_t length = 8;
 static char *sep_char = "-";
 static size_t sep_char_length = 1;
 
-void init(char **config) {
+uint8_t init(char **config) {
+    if (!sveq(api_ver, API_VERSION)) {
+        return MFERR_APIVER;
+    }
+
     for (char *opt = *config; opt != NULL; opt = *++config) {
         if (strncmp(opt, "sep", 3) == 0) {
             char *valstr = opt + 4; // skip 'sep='
@@ -47,6 +57,8 @@ void init(char **config) {
             }
         }
     }
+
+    return 0;
 }
 
 const char *get(void) {