add getline impl

engine/include/GearSrc/File.h

@@ -8,12 +8,16 @@
 extern "C" {
 #endif
 
+/* file.c */
 GSDECL GSFile	    GSFileOpen(GSEngine engine, const char* path);
 GSDECL int	    GSFileRead(GSFile file, void* out, int size);
 GSDECL void	    GSFileSeek(GSFile file, int pos);
 GSDECL unsigned int GSFileSize(GSFile file);
 GSDECL void	    GSFileClose(GSFile file);
 
+/* getline.c */
+GSDECL int GSFileGetLine(char** lineptr, int* n, FILE* fp);
+
 #ifdef __cplusplus
 }
 #endif

engine/src/getline.c

@@ -0,0 +1,54 @@
+#include <GearSrc/File.h>
+
+#define GETLINE_MINSIZE 16
+
+int GSFileGetLine(char** lineptr, int* n, FILE* fp) {
+	int   ch;
+	int   i		  = 0;
+	char  free_on_err = 0;
+	char* p;
+
+	if(lineptr == NULL || n == NULL || fp == NULL) {
+		return -1;
+	}
+	if(*lineptr == NULL) {
+		*n	 = GETLINE_MINSIZE;
+		*lineptr = (char*)malloc(sizeof(char) * (*n));
+		if(*lineptr == NULL) {
+			return -1;
+		}
+		free_on_err = 1;
+	}
+
+	for(i = 0;; i++) {
+		ch = fgetc(fp);
+		while(i >= (*n) - 2) {
+			*n *= 2;
+			p = realloc(*lineptr, sizeof(char) * (*n));
+			if(p == NULL) {
+				if(free_on_err)
+					free(*lineptr);
+				return -1;
+			}
+			*lineptr = p;
+		}
+		if(ch == EOF) {
+			if(i == 0) {
+				if(free_on_err)
+					free(*lineptr);
+				return -1;
+			}
+			(*lineptr)[i] = '\0';
+			*n	      = i;
+			return i;
+		}
+
+		if(ch == '\n') {
+			(*lineptr)[i]	  = '\n';
+			(*lineptr)[i + 1] = '\0';
+			*n		  = i + 1;
+			return i + 1;
+		}
+		(*lineptr)[i] = (char)ch;
+	}
+}

engine/tools/CMakeLists.txt

@@ -5,6 +5,7 @@ include(GNUInstallDirs)
 macro(compile_tool name)
 	file(GLOB ${name}_SRC ${name}/*.c)
 	add_executable(${name} ${${name}_SRC})
+	target_link_libraries(${name} PRIVATE GearSrc)
 	install_target(${name})
 endmacro()
 

engine/tools/gs_dumpfont/main.c

@@ -2,14 +2,16 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <GearSrc/File.h>
+
 #include <stb_image_write.h>
 
 #define CHECK(s) ((linelen > strlen(s)) && memcmp(line, s, strlen(s)) == 0)
 
 int main() {
 	char*	       line = NULL;
-	size_t	       linesize;
+	int	       linesize;
-	ssize_t	       linelen;
+	int	       linelen;
 	int	       iw, ih;
 	unsigned char* font = NULL;
 	int	       c;
@@ -17,7 +19,7 @@ int main() {
 	int	       y = 0;
 	int	       w, h;
 
-	while((linelen = getline(&line, &linesize, stdin)) != -1) {
+	while((linelen = GSFileGetLine(&line, &linesize, stdin)) != -1) {
 		linelen--;
 
 		line[linelen] = 0;