diff --git a/Makefile b/Makefile
index 00ef21f..06b0854 100644
--- a/Makefile
+++ b/Makefile
@@ -31,7 +31,8 @@ splint:
 	splint -posix-lib -standard -mustfreefresh -mustfreeonly -temptrans -immediatetrans -branchstate \
 		-compmempass -nullret -nullpass -nullderef -kepttrans -boolops -initallelements -fullinitblock \
 		-compdef -usereleased -unrecog -dependenttrans -predboolothers -ownedtrans -unqualifiedtrans \
-		-onlytrans $(CFILES) bp.c
+		-onlytrans -usedef -nullassign -compdestroy -globstate -nullstate -statictrans -predboolint \
+		$(CFILES) bp.c
 
 install: $(NAME)
 	mkdir -p -m 755 "$(PREFIX)/share/man/man1" "$(PREFIX)/bin" "$(SYSCONFDIR)/xdg/$(NAME)"
diff --git a/bp.c b/bp.c
index ea6360c..b9e5eb5 100644
--- a/bp.c
+++ b/bp.c
@@ -132,8 +132,8 @@ static int is_text_file(const char *filename)
 {
     int fd = open(filename, O_RDONLY);
     if (fd < 0) return 0;
-    unsigned char buf[64];
-    ssize_t len = read(fd, buf, sizeof(buf)/sizeof(unsigned char));
+    char buf[64];
+    ssize_t len = read(fd, buf, sizeof(buf)/sizeof(char));
     if (len < 0) return 0;
     (void)close(fd);
 
@@ -264,7 +264,7 @@ static void confirm_replacements(file_t *f, match_t *m, confirm_t *confirm)
 //
 static int inplace_modify_file(def_t *defs, file_t *f, pat_t *pattern)
 {
-    char tmp_filename[PATH_MAX+1] = {0};
+    char tmp_filename[PATH_MAX+1] = {'\0'};
     printer_t pr = {
         .file = f,
         .context_lines = ALL_CONTEXT,
@@ -396,7 +396,7 @@ static int process_dir(def_t *defs, const char *dirname, pat_t *pattern)
 {
     int matches = 0;
     glob_t globbuf;
-    char globpath[PATH_MAX+1] = {0};
+    char globpath[PATH_MAX+1] = {'\0'};
     check(snprintf(globpath, PATH_MAX, "%s/*", dirname) <= (int)PATH_MAX,
           "Filename is too long: %s/*", dirname);
     int status = glob(globpath, 0, NULL, &globbuf);
diff --git a/files.c b/files.c
index fba666a..9912226 100644
--- a/files.c
+++ b/files.c
@@ -48,7 +48,7 @@ static void populate_lines(file_t *f)
 //
 file_t *load_filef(file_t **files, const char *fmt, ...)
 {
-    char filename[PATH_MAX+1] = {0};
+    char filename[PATH_MAX+1] = {'\0'};
     va_list args;
     va_start(args, fmt);
     check(vsnprintf(filename, PATH_MAX, fmt, args) <= (int)PATH_MAX,
diff --git a/match.c b/match.c
index a8451e6..eb9b383 100644
--- a/match.c
+++ b/match.c
@@ -271,7 +271,7 @@ static match_t *match(def_t *defs, file_t *f, const char *str, pat_t *pat, bool
                 match_t *mp = match(defs, f, str, pat->args.repetitions.repeat_pat, ignorecase);
                 if (mp == NULL) {
                     str = start;
-                    recycle_if_unused(&msep);
+                    if (msep) recycle_if_unused(&msep);
                     break;
                 }
                 if (mp->end == start && reps > 0) {
@@ -281,7 +281,7 @@ static match_t *match(def_t *defs, file_t *f, const char *str, pat_t *pat, bool
                     // the next loop either. We know that this will continue to
                     // loop until reps==max, so let's just cut to the chase
                     // instead of looping infinitely.
-                    recycle_if_unused(&msep);
+                    if (msep) recycle_if_unused(&msep);
                     recycle_if_unused(&mp);
                     if (pat->args.repetitions.max == -1)
                         reps = ~(size_t)0;
@@ -573,7 +573,6 @@ match_t *get_capture(match_t *m, const char **id)
         if (**id == ';') ++(*id);
         return cap;
     }
-    return NULL;
 }
 
 //
diff --git a/print.c b/print.c
index c5610a9..21c1aee 100644
--- a/print.c
+++ b/print.c
@@ -2,6 +2,7 @@
 // print.c - Code for printing and visualizing matches.
 //
 
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -347,7 +348,7 @@ static void _print_match(FILE *out, printer_t *pr, match_t *m)
 void print_match(FILE *out, printer_t *pr, match_t *m)
 {
     current_color = color_normal;
-    int first = (pr->pos == NULL);
+    bool first = (pr->pos == NULL);
     if (first) { // First match printed:
         pr->pos = pr->file->contents;
         pr->needs_line_number = 1;
diff --git a/utils.c b/utils.c
index 93de1f4..08a5b6f 100644
--- a/utils.c
+++ b/utils.c
@@ -101,7 +101,7 @@ char unescapechar(const char *escaped, const char **end)
             break;
         }
         case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': { // Octal
-            ret = (unsigned char)escaped[0] - '0';
+            ret = (unsigned char)(escaped[0] - '0');
             if ('0' <= escaped[1] && escaped[1] <= '7') {
                 ++len;
                 ret = (ret << 3) | (escaped[1] - '0');