Fixed faulty format command

.clang-format

@@ -0,0 +1 @@
+IndentWidth: 4

CHANGELOG.md

@@ -0,0 +1,34 @@
+# Upcoming
+## v1.0
+* Switched build to CMake
+* Completely overhauled code structure
+* Add a desktop entry when installing
+  based on [desktopentry](https://st.suckless.org/patches/desktopentry/)
+
+## v1.1
+* Configurable transparency (focused and unfocused)
+  based on [alpha](https://st.suckless.org/patches/alpha/) and 
+  [alpha focus highlight](https://st.suckless.org/patches/alpha_focus_highlight/)
+* Proper resizing (aka don't snap to nearest character size)
+  based on [anysize](https://st.suckless.org/patches/anysize/)
+* Copy to clipboard on selection
+  based on [one clipboard](https://st.suckless.org/patches/clipboard/)
+
+## v1.2
+* Add better/gapless rendering of lines/blocks
+  based on [boxdraw](https://st.suckless.org/patches/boxdraw/)
+* Add support for multiple fonts
+  based on [font2](https://st.suckless.org/patches/font2/)
+* Hide cursor when working in the terminal
+  based on [hidecursor](https://st.suckless.org/patches/hidecursor/)
+
+## v1.3
+* Add ligature support
+  based on [ligature support](https://st.suckless.org/patches/ligatures/)
+* Support for multiple color pallets
+* Paste on right click
+* Scrollback support
+* Center lines smaller than max height
+  based on [vertcenter](https://st.suckless.org/patches/vertcenter/)
+* Visual bell
+  based on [visualbell](https://st.suckless.org/patches/visualbell/)

Makefile

@@ -1,67 +1,39 @@
+# =====CONFIG=====
 SRC_DIR        := src
 BUILD_DIR      := build
 RELEASE_DIR    := $(BUILD_DIR)/release
 DEBUG_DIR      := $(BUILD_DIR)/debug
+MINSIZEREL_DIR := $(BUILD_DIR)/min_size_rel
 BINARY         := stj
 CORES          := $(shell nproc --all)
 PREFIX         := /usr/local
 MANPREFIX      := $(PREFIX)/share/man
 
+
 all: debug
 .PHONY: all
 
 
-# Installation & removal
+# =====INSTALL & UNINSTALL=====
 install: release
-	mkdir -p $(DESTDIR)$(PREFIX)/bin
-	cp -f build/release/stj $(DESTDIR)$(PREFIX)/bin
-	chmod 755 $(DESTDIR)$(PREFIX)/bin/stj
-	mkdir -p $(DESTDIR)$(MANPREFIX)/man1
-	sed "s/VERSION/$(VERSION)/g" < data/stj.1 > $(DESTDIR)$(MANPREFIX)/man1/stj.1
-	chmod 644 $(DESTDIR)$(MANPREFIX)/man1/stj.1
-	tic -sx data/stj.info
-	cp -f data/stj.desktop $(DESTDIR)$(PREFIX)/share/applications
+	@ mkdir -p '$(DESTDIR)$(PREFIX)/bin'
+	@ cp -f '$(RELEASE_DIR)/$(BINARY)' '$(DESTDIR)$(PREFIX)/bin'
+	@ chmod 755 '$(DESTDIR)$(PREFIX)/bin/$(BINARY)'
+	@ mkdir -p '$(DESTDIR)$(MANPREFIX)/man1'
+	@ sed "s/VERSION/$(VERSION)/g" < 'data/stj.1' > '$(DESTDIR)$(MANPREFIX)/man1/$(BINARY).1'
+	@ chmod 644 '$(DESTDIR)$(MANPREFIX)/man1/$(BINARY).1'
+	@ tic -sx 'data/stj.info'
+	@ cp -f 'data/$(BINARY).desktop' '$(DESTDIR)$(PREFIX)/share/applications'
+.PHONY: install
 
 uninstall:
-	rm -f $(DESTDIR)$(PREFIX)/bin/stj
-	rm -f $(DESTDIR)$(MANPREFIX)/man1/stj.1
-	rm -f $(DESTDIR)$(PREFIX)/share/applications/stj.desktop
+	@ rm -f '$(DESTDIR)$(PREFIX)/bin/$(BINARY)'
+	@ rm -f '$(DESTDIR)$(MANPREFIX)/man1/$(BINARY).1'
+	@ rm -f '$(DESTDIR)$(PREFIX)/share/applications/$(BINARY).desktop'
+.PHONY: uninstall
 
 
-# Full clean
-clean:
-	@ [ ! -e '$(BINARY)' ] || rm '$(BINARY)'
-	@ rm -rf '$(BUILD_DIR)'
-.PHONY: clean
-
-
-# Release
-run-release: release
-	@ ./'$(RELEASE_DIR)/$(BINARY)'
-.PHONY: run-release
-
-release: $(RELEASE_DIR)/Makefile
-	@ make -C '$(RELEASE_DIR)' -j'$(CORES)' && \
-		ln -sf '$(RELEASE_DIR)'/'$(BINARY)' ./'$(BINARY)'
-.PHONY: release
-
-$(RELEASE_DIR)/Makefile: $(SRC_DIR)/CMakeLists.txt
-	@ cmake \
-		-H'$(SRC_DIR)' \
-		-B'$(RELEASE_DIR)' \
-		-DCMAKE_BUILD_TYPE=Release \
-		-DCMAKE_EXPORT_COMPILE_COMMANDS=ON
-
-clean-release:
-	@ rm -rf '$(RELEASE_DIR)'
-.PHONY: clean-release
-
-
-# Debug
-run-debug: debug
-	@ ./'$(DEBUG_DIR)/$(BINARY)'
-.PHONY: run-debug
-
+# =====DEBUG=====
 debug: $(DEBUG_DIR)/Makefile
 	@ make -C '$(DEBUG_DIR)' -j'$(CORES)' && \
 		ln -sf '$(DEBUG_DIR)/$(BINARY)' ./'$(BINARY)'
@@ -74,6 +46,48 @@ $(DEBUG_DIR)/Makefile: $(SRC_DIR)/CMakeLists.txt
 		-DCMAKE_BUILD_TYPE=Debug \
 		-DCMAKE_EXPORT_COMPILE_COMMANDS=ON
 
+
+# =====RELEASE=====
+release: $(RELEASE_DIR)/Makefile
+	@ make -C '$(RELEASE_DIR)' -j'$(CORES)' && \
+		ln -sf '$(RELEASE_DIR)'/'$(BINARY)' ./'$(BINARY)'
+.PHONY: release
+
+$(RELEASE_DIR)/Makefile: $(SRC_DIR)/CMakeLists.txt
+	@ cmake \
+		-H'$(SRC_DIR)' \
+		-B'$(RELEASE_DIR)' \
+		-DCMAKE_BUILD_TYPE=Release \
+
+
+# =====MINIMUM SIZE RELEASE=====
+minsizerel: $(MINSIZEREL_DIR)/Makefile
+	@ make -C '$(MINSIZEREL_DIR)' -j'$(CORES)' && \
+		ln -sf '$(MINSIZEREL_DIR)'/'$(BINARY)' ./'$(BINARY)'
+.PHONY: minsizerel
+
+$(MINSIZEREL_DIR)/Makefile: $(SRC_DIR)/CMakeLists.txt
+	@ cmake \
+		-H'$(SRC_DIR)' \
+		-B'$(MINSIZEREL_DIR)' \
+		-DCMAKE_BUILD_TYPE=MinSizeRel \
+
+
+# =====CLEANING=====
+clean:
+	@ [ ! -e '$(BINARY)' ] || rm '$(BINARY)'
+	@ rm -rf '$(BUILD_DIR)'
+.PHONY: clean
+
+clean-release:
+	@ rm -rf '$(RELEASE_DIR)'
+.PHONY: clean-release
+
 clean-debug:
 	@ rm -rf '$(DEBUG_DIR)'
 .PHONY: clean-debug
+
+
+# =====FORMAT CODE=====
+format:
+	@ find src/ -iname '*.c' -or -iname '*.h' | xargs clang-format --style=file -i

src/CMakeLists.txt

@@ -5,27 +5,31 @@ if (NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Release)
 endif()
 
+set(SYSTEM_TYPE x64)
 
-# =====COMPILER=====
+
+# =====COMMON SETTINGS=====
 set(CMAKE_C_COMPILER "clang-11")
 set(CMAKE_C_STANDARD 11)
 
-
 project(stj VERSION 0.1)
 
-
-# =====COMPILE FLAGS=====
 add_definitions(-DVERSION="${CMAKE_PROJECT_VERSION}" -D_XOPEN_SOURCE=600)
 
-# Debug flags
-# -g flag gets auto-added by CMake for the debug build
-set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -Wall -O0 -march=native")
-set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -fno-omit-frame-pointer -fsanitize=address")
-set(CMAKE_LINKER_FLAGS_DEBUG "${CMAKE_LINKER_FLAGS_DEBUG} -fno-omit-frame-pointer -fsanitize=address -pedantic")
 
-# Release flags
-# -O3 gets added automatically by CMake
-set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -Werror -march=native -pedantic-errors")
+# =====BUILD TYPES=====
+# Debug
+set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -g -Wall -O0 -fsanitize=address -fno-omit-frame-pointer")
+set(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} -fno-omit-frame-pointer -fsanitize=address -pedantic")
+
+# Arch doesn't use static libraries
+if(NOT EXISTS "/etc/arch-release")
+    set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -static-libasan")
+    set(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} -static-libasan")
+endif()
+
+# Release
+set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -O3 -Werror -pedantic-errors")
 
 
 # =====EXECUTABLE=====
@@ -39,8 +43,10 @@ add_executable(stj x.c "${st_SRC}" "${main_SRC}")
 find_package(Freetype 2 REQUIRED)
 target_include_directories(stj PRIVATE "${FREETYPE_INCLUDE_DIRS}")
 target_link_libraries(stj PRIVATE "${FREETYPE_LIBRARIES}")
+target_link_libraries(stj PRIVATE Xft)
+target_link_libraries(stj PRIVATE Xrender)
 
-find_package(Fontconfig REQUIRED)
+find_package(Fontconfig 2 REQUIRED)
 target_include_directories(stj PRIVATE "${Fontconfig_INCLUDE_DIRS}")
 target_link_libraries(stj PRIVATE "${Fontconfig_LIBRARIES}")
 
@@ -48,8 +54,9 @@ find_package(X11 REQUIRED)
 target_include_directories(stj PRIVATE "${X11_INCLUDE_DIR}")
 target_link_libraries(stj PRIVATE "${X11_LIBRARIES}")
 
+# Normally provided with clang
 target_link_libraries(stj PRIVATE m)
-target_link_libraries(stj PRIVATE rt)
+# I'm not sure if I actually need this, so keeping it here for reference
+# target_link_libraries(stj PRIVATE rt)
+
 target_link_libraries(stj PRIVATE util)
-target_link_libraries(stj PRIVATE Xft)
-target_link_libraries(stj PRIVATE Xrender)

src/st/st.c

@@ -20,6 +20,7 @@
 #include "../win.h"
 #include "macros.h"
 #include "st.h"
+#include "utf8.h"
 
 #if defined(__linux)
 #include <pty.h>
@@ -30,8 +31,6 @@
 #endif
 
 /* Arbitrary sizes */
-#define UTF_INVALID 0xFFFD
-#define UTF_SIZE 4
 #define ESC_BUF_SIZ (128 * UTF_SIZE)
 #define ESC_ARG_SIZ 16
 #define STR_BUF_SIZ ESC_BUF_SIZ
@@ -205,11 +204,6 @@ static void selnormalize(void);
 static void selscroll(int, int);
 static void selsnap(int *, int *, int);
 
-static size_t utf8decode(const char *, Rune *, size_t);
-static Rune utf8decodebyte(char, size_t *);
-static char utf8encodebyte(Rune, size_t);
-static size_t utf8validate(Rune *, size_t);
-
 static char *base64dec(const char *);
 static char base64dec_getc(const char **);
 
@@ -224,114 +218,74 @@ static int iofd = 1;
 static int cmdfd;
 static pid_t pid;
 
-static uchar utfbyte[UTF_SIZE + 1] = {0x80, 0, 0xC0, 0xE0, 0xF0};
-static uchar utfmask[UTF_SIZE + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
-static Rune utfmin[UTF_SIZE + 1] = {0, 0, 0x80, 0x800, 0x10000};
-static Rune utfmax[UTF_SIZE + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
-
-ssize_t xwrite(int fd, const char *s, size_t len) {
-  size_t aux = len;
+/**
+ * Same as write, but ensures that all bytes are written to the descriptor
+ * (write sometimes isn't able to write all bytes)
+ *
+ * @param p_file_desc file descriptor to write to; same logic as write
+ * @param p_str char array to write to the file descriptor
+ * @param p_nbytes amount of bytes to write
+ * @return p_nbytes if the write was successful, otherwise return negative error
+ *                  value of write
+ */
+ssize_t xwrite(int p_file_desc, const char *p_str, size_t p_nbytes) {
+    size_t aux = p_nbytes;
     ssize_t result;
 
-  while (len > 0) {
-    result = write(fd, s, len);
+    while (p_nbytes > 0) {
+        result = write(p_file_desc, p_str, p_nbytes);
 
         // This means an error occured in write, so it passes the error along
         if (result < 0)
             return result;
 
-    len -= result;
-    s += result;
+        p_nbytes -= (size_t)result;
+        p_str += result;
     }
 
-  return aux;
+    return (ssize_t)aux;
 }
 
-// Same as malloc, but stops entire program if malloc fails
-void *safe_malloc(size_t len) {
+/**
+ * same as malloc, but kill the program if it fails
+ *
+ * @param p_len bytes to allocate
+ * @return pointer to allocated memory
+ */
+void *safe_malloc(size_t p_len) {
     void *ptr;
 
-  if (!(ptr = malloc(len)))
+    if (!(ptr = malloc(p_len)))
         die("malloc: %s\n", strerror(errno));
 
     return ptr;
 }
 
-// Same as realloc, but stops entire program if malloc fails
-void *safe_realloc(void *ptr, size_t len) {
-  if ((ptr = realloc(ptr, len)) == NULL)
+/**
+ * same as realloc, but kill the program if it fails
+ *
+ * @param p_ptr pointer to re-allocate
+ * @param p_len bytes to re-allocate
+ * @return pointer to re-allocated memory
+ */
+void *safe_realloc(void *p_ptr, size_t p_len) {
+    if ((p_ptr = realloc(p_ptr, p_len)) == NULL)
         die("realloc: %s\n", strerror(errno));
 
-  return ptr;
+    return p_ptr;
 }
 
-char *safe_strdup(char *s) {
-  if ((s = strdup(s)) == NULL)
+/**
+ * same as strdup, but kill the program if it fails
+ *
+ * @param p_str string to copy
+ * @return pointer to copy of original string
+ */
+char *safe_strdup(char *p_str) {
+    if ((p_str = strdup(p_str)) == NULL)
         die("strdup: %s\n", strerror(errno));
 
-  return s;
-}
-
-size_t utf8decode(const char *chr, Rune *u, size_t chr_len) {
-  size_t i, j, len, type;
-  Rune udecoded;
-
-  *u = UTF_INVALID;
-  if (!chr_len) // chr_len is 0, so just return 0
-    return 0;
-
-  udecoded = utf8decodebyte(chr[0], &len);
-  if (!BETWEEN(len, 1, UTF_SIZE))
-    return 1;
-
-  for (i = 1, j = 1; i < chr_len && j < len; ++i, ++j) {
-    udecoded = (udecoded << 6) | utf8decodebyte(chr[i], &type);
-    if (type != 0)
-      return j;
-  }
-
-  if (j < len)
-    return 0;
-
-  *u = udecoded;
-  utf8validate(u, len);
-
-  return len;
-}
-
-Rune utf8decodebyte(char c, size_t *i) {
-  for (*i = 0; *i < LEN(utfmask); ++(*i))
-    if (((uchar)c & utfmask[*i]) == utfbyte[*i])
-      return (uchar)c & ~utfmask[*i];
-
-  return 0;
-}
-
-size_t utf8encode(Rune u, char *c) {
-  size_t len, i;
-
-  len = utf8validate(&u, 0);
-  if (len > UTF_SIZE)
-    return 0;
-
-  for (i = len - 1; i != 0; --i) {
-    c[i] = utf8encodebyte(u, 0);
-    u >>= 6;
-  }
-  c[0] = utf8encodebyte(u, len);
-
-  return len;
-}
-
-char utf8encodebyte(Rune u, size_t i) { return utfbyte[i] | (u & ~utfmask[i]); }
-
-size_t utf8validate(Rune *u, size_t i) {
-  if (!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
-    *u = UTF_INVALID;
-  for (i = 1; *u > utfmax[i]; ++i)
-    ;
-
-  return i;
+    return p_str;
 }
 
 static const char base64_digits[] = {
@@ -1019,7 +973,8 @@ void selscroll(int orig, int n) {
     if (sel.ob.x == -1)
         return;
 
-  if (BETWEEN(sel.nb.y, orig, term.bot) != BETWEEN(sel.ne.y, orig, term.bot)) {
+    if (BETWEEN(sel.nb.y, orig, term.bot) !=
+        BETWEEN(sel.ne.y, orig, term.bot)) {
         selclear();
     } else if (BETWEEN(sel.nb.y, orig, term.bot)) {
         sel.ob.y += n;
@@ -1247,8 +1202,8 @@ void tsetattr(int *attr, int l) {
         switch (attr[i]) {
         case 0:
             term.c.attr.mode &=
-          ~(ATTR_BOLD | ATTR_FAINT | ATTR_ITALIC | ATTR_UNDERLINE | ATTR_BLINK |
-            ATTR_REVERSE | ATTR_INVISIBLE | ATTR_STRUCK);
+                ~(ATTR_BOLD | ATTR_FAINT | ATTR_ITALIC | ATTR_UNDERLINE |
+                  ATTR_BLINK | ATTR_REVERSE | ATTR_INVISIBLE | ATTR_STRUCK);
             term.c.attr.fg = defaultfg;
             term.c.attr.bg = defaultbg;
             break;
@@ -1323,7 +1278,8 @@ void tsetattr(int *attr, int l) {
             } else if (BETWEEN(attr[i], 100, 107)) {
                 term.c.attr.bg = attr[i] - 100 + 8;
             } else {
-        fprintf(stderr, "erresc(default): gfx attr %d unknown\n", attr[i]);
+                fprintf(stderr, "erresc(default): gfx attr %d unknown\n",
+                        attr[i]);
                 csidump();
             }
             break;
@@ -1441,7 +1397,8 @@ void tsetmode(int priv, int set, int *args, int narg) {
                           codes. */
                 break;
             default:
-        fprintf(stderr, "erresc: unknown private set/reset mode %d\n", *args);
+                fprintf(stderr, "erresc: unknown private set/reset mode %d\n",
+                        *args);
                 break;
             }
         } else {
@@ -1619,7 +1576,8 @@ void csihandle(void) {
         break;
     case 'X': /* ECH -- Erase <n> char */
         DEFAULT(csiescseq.arg[0], 1);
-    tclearregion(term.c.x, term.c.y, term.c.x + csiescseq.arg[0] - 1, term.c.y);
+        tclearregion(term.c.x, term.c.y, term.c.x + csiescseq.arg[0] - 1,
+                     term.c.y);
         break;
     case 'P': /* DCH -- Delete <n> char */
         DEFAULT(csiescseq.arg[0], 1);
@@ -1641,8 +1599,8 @@ void csihandle(void) {
         break;
     case 'n': /* DSR – Device Status Report (cursor position) */
         if (csiescseq.arg[0] == 6) {
-      len =
-          snprintf(buf, sizeof(buf), "\033[%i;%iR", term.c.y + 1, term.c.x + 1);
+            len = snprintf(buf, sizeof(buf), "\033[%i;%iR", term.c.y + 1,
+                           term.c.x + 1);
             ttywrite(buf, len, 0);
         }
         break;
@@ -2108,8 +2066,8 @@ int eschandle(uchar ascii) {
             strhandle();
         break;
     default:
-    fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", (uchar)ascii,
-            isprint(ascii) ? ascii : '.');
+        fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
+                (uchar)ascii, isprint(ascii) ? ascii : '.');
         break;
     }
     return 1;

src/st/st.h

@@ -3,9 +3,12 @@
 #ifndef ST_H
 #define ST_H
 
+#include <stddef.h>
 #include <stdint.h>
 #include <sys/types.h>
-#include <stddef.h>
+
+#include "types.h"
+#include "utf8.h"
 
 enum glyph_attribute {
     ATTR_NULL = 0,
@@ -23,28 +26,11 @@ enum glyph_attribute {
     ATTR_BOLD_FAINT = ATTR_BOLD | ATTR_FAINT,
 };
 
-enum selection_mode {
-	SEL_IDLE = 0,
-	SEL_EMPTY = 1,
-	SEL_READY = 2
-};
+enum selection_mode { SEL_IDLE = 0, SEL_EMPTY = 1, SEL_READY = 2 };
 
-enum selection_type {
-	SEL_REGULAR = 1,
-	SEL_RECTANGULAR = 2
-};
+enum selection_type { SEL_REGULAR = 1, SEL_RECTANGULAR = 2 };
 
-enum selection_snap {
-	SNAP_WORD = 1,
-	SNAP_LINE = 2
-};
-
-typedef unsigned char uchar;
-typedef unsigned int uint;
-typedef unsigned long ulong;
-typedef unsigned short ushort;
-
-typedef uint_least32_t Rune;
+enum selection_snap { SNAP_WORD = 1, SNAP_LINE = 2 };
 
 #define Glyph Glyph_
 typedef struct {

src/st/types.h

@@ -0,0 +1,9 @@
+#ifndef TYPES_H
+#define TYPES_H
+
+typedef unsigned char uchar;
+typedef unsigned int uint;
+typedef unsigned long ulong;
+typedef unsigned short ushort;
+
+#endif

src/st/utf8.c

@@ -0,0 +1,103 @@
+#include "utf8.h"
+#include "macros.h"
+#include "types.h"
+
+static uchar utfbyte[UTF_SIZE + 1] = {0x80, 0, 0xC0, 0xE0, 0xF0};
+static uchar utfmask[UTF_SIZE + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
+static Rune utfmin[UTF_SIZE + 1] = {0, 0, 0x80, 0x800, 0x10000};
+static Rune utfmax[UTF_SIZE + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
+
+/**
+ * Decode a given char array into a utf8 Rune
+ *
+ * @param p_char char array to decode
+ * @param p_rune rune pointer to decode to
+ * @param p_char_len length of the char array
+ * @return size of the decoded rune
+ */
+size_t utf8decode(const char *p_char, Rune *p_rune, size_t p_char_len) {
+    size_t decoded_len, type, i;
+    Rune decoded_rune;
+
+    *p_rune = UTF_INVALID;
+    if (!p_char_len) // p_char_len is 0, so just return 0
+        return 0;
+
+    decoded_rune = utf8decodebyte(p_char[0], &decoded_len);
+    if (!BETWEEN(decoded_len, 1, UTF_SIZE))
+        return 1;
+
+    for (i = 1; i < p_char_len && i < decoded_len; ++i) {
+        decoded_rune = (decoded_rune << 6) | utf8decodebyte(p_char[i], &type);
+
+        if (type != 0)
+            return i;
+    }
+
+    if (i < decoded_len)
+        return 0;
+
+    *p_rune = decoded_rune;
+    utf8validate(p_rune, decoded_len);
+
+    return decoded_len;
+}
+
+/**
+ * Decode a single byte to UTF-8
+ *
+ * @param p_char char to decode
+ * @param p_i counter used in internal for loop
+ * @return decoded rune
+ */
+Rune utf8decodebyte(char p_char, size_t *p_i) {
+    for (*p_i = 0; *p_i < LEN(utfmask); ++(*p_i)) {
+        if (((uchar)p_char & utfmask[*p_i]) == utfbyte[*p_i])
+            return (uchar)p_char & ~utfmask[*p_i];
+    }
+
+    return 0;
+}
+
+/**
+ * Encode a UTF-8 rune
+ *
+ * @param p_rune rune to encode
+ * @param p_char char array to encode to
+ * @return
+ */
+size_t utf8encode(Rune p_rune, char *p_char) {
+    size_t len, i;
+
+    len = utf8validate(&p_rune, 0);
+    if (len > UTF_SIZE)
+        return 0;
+
+    for (i = len - 1; i != 0; --i) {
+        p_char[i] = utf8encodebyte(p_rune, 0);
+        p_rune >>= 6;
+    }
+    p_char[0] = utf8encodebyte(p_rune, len);
+
+    return len;
+}
+
+char utf8encodebyte(Rune u, size_t i) { return utfbyte[i] | (u & ~utfmask[i]); }
+
+/**
+ * Check if a given rune is a valid UTF-8 rune
+ *
+ * @param p_rune rune to validate
+ * @param i
+ */
+size_t utf8validate(Rune *p_rune, size_t i) {
+    if (!BETWEEN(*p_rune, utfmin[i], utfmax[i]) ||
+        BETWEEN(*p_rune, 0xD800, 0xDFFF))
+        *p_rune = UTF_INVALID;
+
+    // Count up i until you find a utfmax entry that's greater than *p_rune
+    for (i = 1; *p_rune > utfmax[i]; ++i)
+        ;
+
+    return i;
+}

src/st/utf8.h

@@ -0,0 +1,17 @@
+#ifndef UTF8_H
+#define UTF8_H
+
+#include <stdint.h>
+#include <stdlib.h>
+
+#define UTF_INVALID 0xFFFD
+#define UTF_SIZE 4
+
+typedef uint_least32_t Rune;
+
+size_t utf8decode(const char *, Rune *, size_t);
+Rune utf8decodebyte(char, size_t *);
+char utf8encodebyte(Rune, size_t);
+size_t utf8validate(Rune *, size_t);
+
+#endif

src/x.c

@@ -379,11 +379,11 @@ void mousereport(XEvent *e) {
     }
 
     if (IS_SET(MODE_MOUSESGR)) {
-    len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c", button, x + 1, y + 1,
-                   e->xbutton.type == ButtonRelease ? 'm' : 'M');
+        len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c", button, x + 1,
+                       y + 1, e->xbutton.type == ButtonRelease ? 'm' : 'M');
     } else if (x < 223 && y < 223) {
-    len = snprintf(buf, sizeof(buf), "\033[M%c%c%c", 32 + button, 32 + x + 1,
-                   32 + y + 1);
+        len = snprintf(buf, sizeof(buf), "\033[M%c%c%c", 32 + button,
+                       32 + x + 1, 32 + y + 1);
     } else {
         return;
     }
@@ -569,8 +569,8 @@ void selrequest(XEvent *e) {
     if (xsre->target == xa_targets) {
         /* respond with the supported type */
         string = xsel.xtarget;
-    XChangeProperty(xsre->display, xsre->requestor, xsre->property, XA_ATOM, 32,
-                    PropModeReplace, (uchar *)&string, 1);
+        XChangeProperty(xsre->display, xsre->requestor, xsre->property, XA_ATOM,
+                        32, PropModeReplace, (uchar *)&string, 1);
         xev.property = xsre->property;
     } else if (xsre->target == xsel.xtarget || xsre->target == XA_STRING) {
         /*
@@ -583,7 +583,8 @@ void selrequest(XEvent *e) {
         } else if (xsre->selection == clipboard) {
             seltext = xsel.clipboard;
         } else {
-      fprintf(stderr, "Unhandled clipboard selection 0x%lx\n", xsre->selection);
+            fprintf(stderr, "Unhandled clipboard selection 0x%lx\n",
+                    xsre->selection);
             return;
         }
         if (seltext != NULL) {
@@ -657,8 +658,8 @@ void xresize(int col, int row) {
     win.th = row * win.ch;
 
     XFreePixmap(xw.dpy, xw.buf);
-  xw.buf =
-      XCreatePixmap(xw.dpy, xw.win, win.w, win.h, DefaultDepth(xw.dpy, xw.scr));
+    xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h,
+                           DefaultDepth(xw.dpy, xw.scr));
     XftDrawChange(xw.draw, xw.buf);
     xclear(0, 0, win.w, win.h);
 
@@ -950,12 +951,13 @@ int ximopen(Display *dpy) {
         fprintf(stderr, "XSetIMValues: "
                         "Could not set XNDestroyCallback.\n");
 
-  xw.ime.spotlist = XVaCreateNestedList(0, XNSpotLocation, &xw.ime.spot, NULL);
+    xw.ime.spotlist =
+        XVaCreateNestedList(0, XNSpotLocation, &xw.ime.spot, NULL);
 
     if (xw.ime.xic == NULL) {
-    xw.ime.xic = XCreateIC(xw.ime.xim, XNInputStyle,
-                           XIMPreeditNothing | XIMStatusNothing, XNClientWindow,
-                           xw.win, XNDestroyCallback, &icdestroy, NULL);
+        xw.ime.xic = XCreateIC(
+            xw.ime.xim, XNInputStyle, XIMPreeditNothing | XIMStatusNothing,
+            XNClientWindow, xw.win, XNDestroyCallback, &icdestroy, NULL);
     }
     if (xw.ime.xic == NULL)
         fprintf(stderr, "XCreateIC: Could not create input context.\n");
@@ -965,8 +967,8 @@ int ximopen(Display *dpy) {
 
 void ximinstantiate(Display *dpy, XPointer client, XPointer call) {
     if (ximopen(dpy))
-    XUnregisterIMInstantiateCallback(xw.dpy, NULL, NULL, NULL, ximinstantiate,
-                                     NULL);
+        XUnregisterIMInstantiateCallback(xw.dpy, NULL, NULL, NULL,
+                                         ximinstantiate, NULL);
 }
 
 void ximdestroy(XIM xim, XPointer client, XPointer call) {
@@ -1033,8 +1035,8 @@ void xinit(int cols, int rows) {
     memset(&gcvalues, 0, sizeof(gcvalues));
     gcvalues.graphics_exposures = False;
     dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures, &gcvalues);
-  xw.buf =
-      XCreatePixmap(xw.dpy, xw.win, win.w, win.h, DefaultDepth(xw.dpy, xw.scr));
+    xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h,
+                           DefaultDepth(xw.dpy, xw.scr));
     XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
     XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, win.w, win.h);
 
@@ -1075,8 +1077,8 @@ void xinit(int cols, int rows) {
     XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
 
     xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
-  XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32, PropModeReplace,
-                  (uchar *)&thispid, 1);
+    XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
+                    PropModeReplace, (uchar *)&thispid, 1);
 
     win.mode = MODE_NUMLOCK;
     resettitle();
@@ -1155,7 +1157,8 @@ int xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len,
             if (glyphidx && frc[f].flags == frcflags)
                 break;
             /* We got a default font for a not found glyph. */
-      if (!glyphidx && frc[f].flags == frcflags && frc[f].unicodep == rune) {
+            if (!glyphidx && frc[f].flags == frcflags &&
+                frc[f].unicodep == rune) {
                 break;
             }
         }
@@ -1310,10 +1313,12 @@ void xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len,
     /* Intelligent cleaning up of the borders. */
     if (x == 0) {
         xclear(0, (y == 0) ? 0 : winy, borderpx,
-           winy + win.ch + ((winy + win.ch >= borderpx + win.th) ? win.h : 0));
+               winy + win.ch +
+                   ((winy + win.ch >= borderpx + win.th) ? win.h : 0));
     }
     if (winx + width >= borderpx + win.tw) {
-    xclear(winx + width, (y == 0) ? 0 : winy, win.w,
+        xclear(
+            winx + width, (y == 0) ? 0 : winy, win.w,
             ((winy + win.ch >= borderpx + win.th) ? win.h : (winy + win.ch)));
     }
     if (y == 0)
@@ -1369,7 +1374,8 @@ void xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og) {
     /*
      * Select the right color for the right mode.
      */
-  g.mode &= ATTR_BOLD | ATTR_ITALIC | ATTR_UNDERLINE | ATTR_STRUCK | ATTR_WIDE;
+    g.mode &=
+        ATTR_BOLD | ATTR_ITALIC | ATTR_UNDERLINE | ATTR_STRUCK | ATTR_WIDE;
 
     if (IS_SET(MODE_REVERSE)) {
         g.mode |= ATTR_REVERSE;
@@ -1754,7 +1760,8 @@ void run(void) {
                 trigger = now;
                 drawing = 1;
             }
-      timeout = (maxlatency - TIMEDIFF(now, trigger)) / maxlatency * minlatency;
+            timeout =
+                (maxlatency - TIMEDIFF(now, trigger)) / maxlatency * minlatency;
             if (timeout > 0)
                 continue; /* we have time, try to find idle */
         }