Lecture 110 - Compiling and testing FREAD

Author: nibblebits

PeachOS64Bit/programs/blank/blank.c

@@ -8,7 +8,11 @@ int main(int argc, char** argv)
     int fd = fopen("@:/blank.elf", "r");
     if (fd > 0)
     {
+
+        char buf[512] = {0};
         printf("File blank.elf opened\n");
+        fread(buf, 1, sizeof(buf), fd);
+        
         fclose(fd);
     }
     else

PeachOS64Bit/programs/blank/blank.elf

@@ -1,6 +1,9 @@
 #ifndef USERLAND_FILE_H
 #define USERLAND_FILE_H
 
+#include <stdint.h>
+#include <stddef.h>
+
 int fopen(const char* filename, const char* mode);
 void fclose(int fd);
 int fread(void* buffer, size_t size, size_t count, long fd);

PeachOS64Bit/programs/blank/build/blank.o

@@ -13,7 +13,7 @@ global peachos_system:function
 global peachos_exit:function
 global peachos_fopen:function
 global peachos_fclose:function
-global peachos_read:function
+global peachos_fread:function
 
 ; void print(const char* filename)
 print:
@@ -101,8 +101,8 @@ peachos_fclose:
     add rsp, 8  ; restore the stack
     ret
 
-; long peachos_read(void* buffer, size_t size, size_t count, long fd);
-peachos_read:
+; long peachos_fread(void* buffer, size_t size, size_t count, long fd);
+peachos_fread:
     mov rax, 12 ; Command 12 fread
     push qword rcx ; fd
     push qword rdx ; count

PeachOS64Bit/programs/shell/shell.elf

@@ -34,6 +34,6 @@ void peachos_exit();
 
 int peachos_fopen(const char* filename, const char* mode);
 void peachos_fclose(size_t fd);
-long peachos_read(void* buffer, size_t size, size_t count, long fd);
+long peachos_fread(void* buffer, size_t size, size_t count, long fd);
 
 #endif