Better macros for error handling

src/config.c

@@ -281,8 +281,8 @@ int config_load(VectorPreview *prevs, char *filename)
 {
     int ret = OK;
 
-    FILE *f = fopen(filename, "r");
-    ERRCHK_GOTO(!f, ret, exit, FUNCFAILED("fopen"), ERRNOS);
+    FILE *f;
+    ERRCHK_GOTO_ERN(!(f = fopen(filename, "r")), ret, exit);
 
     lexer = lexer_init(f);
     previews = prevs;

src/ctpv.c

@@ -46,11 +46,9 @@ static void cleanup(void)
 
 static int init_magic(void)
 {
-    ERRCHK_RET(!(magic = magic_open(MAGIC_MIME_TYPE)), FUNCFAILED("magic_open"),
-               magic_error(magic));
+    ERRCHK_RET_MSG(!(magic = magic_open(MAGIC_MIME_TYPE)), magic_error(magic));
 
-    ERRCHK_RET(magic_load(magic, NULL) != 0, FUNCFAILED("magic_load"),
-               magic_error(magic));
+    ERRCHK_RET_MSG(magic_load(magic, NULL) != 0, magic_error(magic));
 
     return OK;
 }
@@ -59,7 +57,7 @@ static int create_dir(char *buf, size_t len)
 {
     char dir[len];
     strncpy(dir, buf, LEN(dir) - 1);
-    ERRCHK_RET(mkpath(dir, 0700) == -1, FUNCFAILED("mkpath"), ERRNOS);
+    ERRCHK_RET_ERN(mkpath(dir, 0700) == -1);
 
     return OK;
 }
@@ -98,7 +96,7 @@ static const char *get_mimetype(const char *path)
 {
     const char *r = magic_file(magic, path);
     if (!r) {
-        PRINTINTERR(FUNCFAILED("magic_file"), magic_error(magic));
+        FUNCFAILED("magic_file", magic_error(magic));
         return NULL;
     }
 
@@ -113,7 +111,7 @@ static int check_file(const char *f)
     }
 
     if (access(f, R_OK) != 0) {
-        print_errorf("failed to access '%s': %s", f, ERRNOS);
+        print_errorf("failed to access '%s': %s", f, strerror(errno));
         return ERR;
     }
 
@@ -123,8 +121,8 @@ static int check_file(const char *f)
 static int is_newer(int *resp, char *f1, char *f2)
 {
     struct stat stat1, stat2;
-    ERRCHK_RET(stat(f1, &stat1) == -1, FUNCFAILED("stat"), ERRNOS);
-    ERRCHK_RET(stat(f2, &stat2) == -1, FUNCFAILED("stat"), ERRNOS);
+    ERRCHK_RET_ERN(stat(f1, &stat1) == -1);
+    ERRCHK_RET_ERN(stat(f2, &stat2) == -1);
 
     int sec_d = stat1.st_mtim.tv_sec - stat2.st_mtim.tv_sec;
     if (sec_d < 0)

src/error.h

@@ -6,20 +6,21 @@
 
 #include "utils.h"
 
-#define ERRNOS strerror(errno)
+#define INTERRMSG "internal error: "
 
-#define FUNCFAILED(f) f "() failed: %s"
+/*
+ * Add error source to error message
+ */
+#define ERRSRC(msg) (__FILE__ ":" STRINGIZE(__LINE__) ": " msg)
 
 /*
  * Print internal error
  */
 #define PRINTINTERR(format, ...) \
-    print_error##__VA_OPT__(f)(ERRS(format) __VA_OPT__(, ) __VA_ARGS__)
+    print_error##__VA_OPT__(f)(ERRSRC(format) __VA_OPT__(, ) __VA_ARGS__)
 
-/*
- * Add error source to error message
- */
-#define ERRS(msg) (__FILE__ ":" STRINGIZE(__LINE__) ": " msg)
+#define FUNCFAILED(f, ...) \
+    PRINTINTERR(INTERRMSG f "() failed" __VA_OPT__(": %s", __VA_ARGS__))
 
 /*
  * If cond is true, return ERR. Also call print_error or
@@ -42,6 +43,19 @@
         }                                         \
     } while (0)
 
+#define ERRCHK_MSG_(x) INTERRMSG "'" x "'"
+
+#define ERRCHK_RET_MSG(cond, ...) \
+    ERRCHK_RET(cond, ERRCHK_MSG_(#cond) __VA_OPT__(": %s", ) __VA_ARGS__)
+
+#define ERRCHK_GOTO_MSG(cond, ret, label, ...) \
+    ERRCHK_GOTO(cond, ret, label,              \
+                ERRCHK_MSG_(#cond) __VA_OPT__(": %s", ) __VA_ARGS__)
+
+#define ERRCHK_RET_ERN(cond) ERRCHK_RET_MSG(cond, strerror(errno))
+#define ERRCHK_GOTO_ERN(cond, ret, label) \
+    ERRCHK_GOTO_MSG(cond, ret, label, strerror(errno))
+
 /*
  * Shortcut for ERRCHK_RET(expr != OK)
  */

src/lexer.c

@@ -148,7 +148,7 @@ Lexer *lexer_init(FILE *f)
     Lexer *ctx;
 
     if (!(ctx = malloc(sizeof(*ctx)))) {
-        PRINTINTERR(FUNCFAILED("malloc"), ERRNOS);
+        FUNCFAILED("malloc", strerror(errno));
         abort();
     }
 

src/preview.c

@@ -51,7 +51,7 @@ void previews_init(Preview *ps, size_t len)
 
     previews.list = malloc(len * PREVP_SIZE);
     if (!previews.list) {
-        PRINTINTERR(FUNCFAILED("malloc"), ERRNOS);
+        FUNCFAILED("malloc", strerror(errno));
         abort();
     }
 
@@ -119,7 +119,7 @@ static void check_init_previews(void)
 static int run(Preview *p, int *exitcode, int *signal)
 {
     int pipe_fds[2];
-    ERRCHK_RET(pipe(pipe_fds) == -1, FUNCFAILED("pipe"), ERRNOS);
+    ERRCHK_RET_ERN(pipe(pipe_fds) == -1);
 
     int sp_arg[] = { pipe_fds[0], pipe_fds[1], STDERR_FILENO };
 
@@ -138,7 +138,7 @@ static int run(Preview *p, int *exitcode, int *signal)
         }
 
         if (len == -1) {
-            PRINTINTERR(FUNCFAILED("read"), ERRNOS);
+            FUNCFAILED("read", strerror(errno));
             ret = ERR;
         }
     }
@@ -148,11 +148,10 @@ static int run(Preview *p, int *exitcode, int *signal)
     return ret;
 }
 
-#define SET_PENV(n, v)                                                 \
-    do {                                                               \
-        if (v)                                                         \
-            ERRCHK_RET(setenv((n), (v), 1) != 0, FUNCFAILED("setenv"), \
-                       ERRNOS);                                        \
+#define SET_PENV(n, v)                                \
+    do {                                              \
+        if (v)                                        \
+            ERRCHK_RET_ERN(setenv((n), (v), 1) != 0); \
     } while (0)
 
 int preview_run(const char *ext, const char *mimetype, PreviewArgs *pa)

src/server.c

@@ -23,7 +23,7 @@ static void kill_ueberzug(void)
         if (errno == ESRCH)
             print_error("ueberzug is not running");
         else
-            PRINTINTERR(FUNCFAILED("kill"), ERRNOS);
+            FUNCFAILED("kill", strerror(errno));
     }
 
     spawn_wait(ueberzug_pid, NULL, NULL);
@@ -36,13 +36,13 @@ static void sig_handler_exit(int s)
 
 static int register_signal(int sig, __sighandler_t handler)
 {
-    ERRCHK_RET(signal(sig, handler), FUNCFAILED("signal"), ERRNOS);
+    ERRCHK_RET_ERN(signal(sig, handler));
     return OK;
 }
 
 static int open_fifo(int *fd, char *f)
 {
-    ERRCHK_RET((*fd = open(f, O_RDONLY | O_NONBLOCK)) == -1, FUNCFAILED("open"), ERRNOS);
+    ERRCHK_RET_ERN((*fd = open(f, O_RDONLY | O_NONBLOCK)) == -1);
 
     return OK;
 }
@@ -63,7 +63,7 @@ static int listen(char *fifo)
     ERRCHK_GOTO_OK(register_signal(SIGTERM, sig_handler_exit), ret, fifo);
 
     int pipe_fds[2];
-    ERRCHK_GOTO(pipe(pipe_fds) == -1, ret, signal, FUNCFAILED("pipe"), ERRNOS);
+    ERRCHK_GOTO_ERN(pipe(pipe_fds) == -1, ret, signal);
 
     char *args[] = { "ueberzug", "layer", NULL };
     int sp_arg[] = { pipe_fds[1], pipe_fds[0], STDIN_FILENO };
@@ -105,7 +105,7 @@ static int listen(char *fifo)
     }
 
 
-    ERRCHK_GOTO(poll_ret < 0, ret, close, FUNCFAILED("poll"), ERRNOS);
+    ERRCHK_GOTO_ERN(poll_ret < 0, ret, close);
 
 close:
     close(pipe_fds[1]);
@@ -154,7 +154,7 @@ int server_listen(const char *id_s)
         if (errno == EEXIST)
             print_errorf("server with id %s is already running or fifo %s still exists", id_s, fifo);
         else
-            PRINTINTERR(FUNCFAILED("mkfifo"), ERRNOS);
+            FUNCFAILED("mkfifo", strerror(errno));
         ret = ERR;
         goto exit;
     }
@@ -163,7 +163,7 @@ int server_listen(const char *id_s)
 
 fifo:
     if (remove(fifo) == -1 && errno != ENOENT)
-        PRINTINTERR(FUNCFAILED("remove"), ERRNOS);
+        FUNCFAILED("remove", strerror(errno));
 
 exit:
     return ret;
@@ -187,7 +187,7 @@ int server_set_fifo_var(const char *id_s)
 {
     char fifo[FIFO_FILENAME_SIZE];
     get_fifo_name(fifo, LEN(fifo), id_s);
-    ERRCHK_RET(setenv("fifo", fifo, 1) != 0, FUNCFAILED("setenv"), ERRNOS);
+    ERRCHK_RET_ERN(setenv("fifo", fifo, 1) != 0);
 
     return OK;
 }

src/shell.c

@@ -15,7 +15,7 @@ char *prepend_helpers(char *str, size_t len)
     size_t l, helpers_len = LEN(scr_helpers_sh) - 1;
 
     if (!(buf = malloc(sizeof(*buf) * (helpers_len + len)))) {
-        PRINTINTERR(FUNCFAILED("malloc"), ERRNOS);
+        FUNCFAILED("malloc", strerror(errno));
         abort();
     }
 

src/ulist.c

@@ -41,7 +41,7 @@ static struct UListNode *ulist_node_new(UList *l, size_t cap)
         cap = DEFAULT_CAP;
 
     if (!(n = malloc(ULIST_NODE_SIZE(cap, l->size)))) {
-        PRINTINTERR(FUNCFAILED("malloc"), ERRNOS);
+        FUNCFAILED("malloc", strerror(errno));
         abort();
     }
 
@@ -57,7 +57,7 @@ UList *ulist_new(size_t size, size_t cap)
     UList *l;
 
     if (!(l = malloc(sizeof(*l)))) {
-        PRINTINTERR(FUNCFAILED("malloc"), ERRNOS);
+        FUNCFAILED("malloc", strerror(errno));
         abort();
     }
 

src/utils.c

@@ -15,8 +15,8 @@ int spawn_redirect(const void *arg)
 {
     int *fds = (int *)arg;
 
-    ERRCHK_RET(close(fds[0]) == -1, FUNCFAILED("close"), ERRNOS);
-    ERRCHK_RET(dup2(fds[1], fds[2]) == -1, FUNCFAILED("dup2"), ERRNOS);
+    ERRCHK_RET_ERN(close(fds[0]) == -1);
+    ERRCHK_RET_ERN(dup2(fds[1], fds[2]) == -1);
 
     return OK;
 }
@@ -24,7 +24,7 @@ int spawn_redirect(const void *arg)
 int spawn_wait(pid_t pid, int *exitcode, int *signal)
 {
     int stat;
-    ERRCHK_RET(waitpid(pid, &stat, 0) == -1, FUNCFAILED("waitpid"), ERRNOS);
+    ERRCHK_RET_ERN(waitpid(pid, &stat, 0) == -1);
 
     if (exitcode)
         *exitcode = -1;
@@ -58,7 +58,7 @@ int spawn(char *args[], pid_t *cpid, int *exitcode, int *signal, int (*cfunc)(co
         *exitcode = -1;
 
     pid_t pid = fork();
-    ERRCHK_RET(pid == -1, FUNCFAILED("fork"), ERRNOS);
+    ERRCHK_RET_ERN(pid == -1);
 
     /* Child process */
     if (pid == 0) {
@@ -69,7 +69,7 @@ int spawn(char *args[], pid_t *cpid, int *exitcode, int *signal, int (*cfunc)(co
         if (errno == ENOENT)
             exit(NOTEXIST_EC);
 
-        PRINTINTERR(FUNCFAILED("exec"), ERRNOS);
+        FUNCFAILED("exec", strerror(errno));
         exit(EXIT_FAILURE);
     }
 

src/vector.c

@@ -15,12 +15,12 @@ Vector *vector_new(size_t size, size_t cap)
         cap = DEFAULT_CAP;
 
     if (!(v = malloc(sizeof(*v)))) {
-        PRINTINTERR(FUNCFAILED("malloc"), ERRNOS);
+        FUNCFAILED("malloc", strerror(errno));
         abort();
     }
 
     if (!(v->buf = malloc(size * cap))) {
-        PRINTINTERR(FUNCFAILED("malloc"), ERRNOS);
+        FUNCFAILED("malloc", strerror(errno));
         abort();
     }
 
@@ -50,7 +50,7 @@ static void resize_if_needed(Vector *vec, size_t new_len)
 
     if (!(p = realloc(vec->buf, vec->size * cap))) {
         vector_free(vec);
-        PRINTINTERR(FUNCFAILED("realloc"), ERRNOS);
+        FUNCFAILED("realloc", strerror(errno));
         abort();
     }