LibC: Fix printf formatting

Previously %02x would not print out padding if the given value was zero.

5 files changed, 12 insertions, 6 deletions

diff --git a/userland/libc/Makefile b/userland/libc/Makefile
index 2be101e..8db5a16 100644
--- a/userland/libc/Makefile
+++ b/userland/libc/Makefile
@@ -2,7 +2,7 @@ CC="i686-sb-gcc"
 AR="i686-sb-ar"
 AS="i686-sb-as"
 CFLAGS = -ggdb -ffreestanding -nostdlib -O0 -Wall -Wextra -pedantic -Werror -Wimplicit-fallthrough -I./include/ -static -I../../include/ -Wno-int-conversion -Wno-unused-parameter
-OBJ=crt0.o libc.o malloc/malloc.o pty.o sys/mman/mmap.o sys/mman/munmap.o memset.o assert.o stdio/snprintf.o stdio/vfprintf.o string/memcpy.o string/memcmp.o string/strcmp.o ubsan.o string/strcpy.o isspace.o stdio/puts.o stdio/putchar.o dirent/opendir.o dirent/readdir.o dirent/closedir.o unistd/getopt.o dirent/scandir.o dirent/alphasort.o stdio/printf.o stdio/vdprintf.o stdio/vprintf.o stdio/dprintf.o stdio/vprintf.o string/strlen.o string/strnlen.o stdio/stdin.o stdio/getchar.o stdio/fgetc.o arpa/inet/htons.o arpa/inet/htonl.o stdio/fread.o stdio/fwrite.o stdio/fopen.o stdio/fclose.o stdio/fseek.o ctype/isascii.o stdio/fprintf.o stdlib/atoi.o stdlib/strtol.o ctype/toupper.o ctype/tolower.o string/strcat.o string/strchr.o string/sscanf.o sys/stat/stat.o stdlib/getenv.o string/strrchr.o stdio/ftell.o stdio/tmpfile.o stdio/fgets.o stdio/feof.o stdio/fscanf.o stdio/ungetc.o string/strncmp.o stdio/fputc.o string/strncpy.o stdio/remove.o stdio/ferror.o stdio/fputs.o stdlib/rand.o stdlib/srand.o unistd/getpid.o stdlib/strtoul.o stdio/fflush.o stdlib/abort.o string/strcspn.o time/localtime.o time/time.o time/clock_gettime.o time/gmtime.o time/strftime.o string/strpbrk.o ctype/isdigit.o ctype/isalpha.o ctype/isxdigit.o ctype/ispunct.o stdio/setvbuf.o stdio/fileno.o stdio/putc.o stdio/sprintf.o stdlib/abs.o string/strspn.o stdlib/qsort.o string/memmove.o setjmp/longjmp.o setjmp/setjmp.o libgen/basename.o string/strdup.o string/strndup.o string/strlcpy.o stdlib/atexit.o stdio/open_memstream.o libgen/dirname.o unistd/unlink.o string/strstr.o string/strcasecmp.o string/strncasecmp.o stdlib/mkstemp.o string/strtok.o unistd/execvp.o unistd/_exit.o ctype/isalnum.o time/ctime_r.o stdlib/strtold.o sys/time/gettimeofday.o stdio/fgetpos.o stdio/fsetpos.o ctype/isprint.o stdlib/system.o stdio/tmpnam.o unistd/msleep.o stdlib/atof.o stdlib/strtod.o stdio/rename.o sys/stat/mkdir.o unistd/uptime.o unistd/ftruncate.o sys/socket/recvfrom.o sys/socket/sendto.o signal/kill.o signal/sigaction.o unistd/chdir.o unistd/getcwd.o stdio/getdelim.o stdio/getline.o unistd/isatty.o sys/socket/listen.o stdlib/realpath.o systemcall.o sys/random/randomfill.o fcntl/open.o unistd/write.o unistd/pwrite.o fcntl/open_process.o tb/sb.o tb/sv.o string/memchr.o stdlib/atol.o stdlib/atoll.o stdlib/strtoll.o sys/stat/fstat.o unistd/lseek.o ctype/isupper.o ctype/islower.o ctype/isblank.o ctype/isgraph.o ctype/iscntrl.o math/ldexp.o sys/socket/connect.o sys/socket/setsockopt.o arpa/inet/ntohl.o arpa/inet/ntohs.o netdb/getaddrinfo.o
+OBJ=crt0.o libc.o malloc/malloc.o pty.o sys/mman/mmap.o sys/mman/munmap.o memset.o assert.o stdio/snprintf.o stdio/vfprintf.o string/memcpy.o string/memcmp.o string/strcmp.o ubsan.o string/strcpy.o isspace.o stdio/puts.o stdio/putchar.o dirent/opendir.o dirent/readdir.o dirent/closedir.o unistd/getopt.o dirent/scandir.o dirent/alphasort.o stdio/printf.o stdio/vdprintf.o stdio/vprintf.o stdio/dprintf.o stdio/vprintf.o string/strlen.o string/strnlen.o stdio/stdin.o stdio/getchar.o stdio/fgetc.o arpa/inet/htons.o arpa/inet/htonl.o stdio/fread.o stdio/fwrite.o stdio/fopen.o stdio/fclose.o stdio/fseek.o ctype/isascii.o stdio/fprintf.o stdlib/atoi.o stdlib/strtol.o ctype/toupper.o ctype/tolower.o string/strcat.o string/strchr.o string/sscanf.o sys/stat/stat.o stdlib/getenv.o string/strrchr.o stdio/ftell.o stdio/tmpfile.o stdio/fgets.o stdio/feof.o stdio/fscanf.o stdio/ungetc.o string/strncmp.o stdio/fputc.o string/strncpy.o stdio/remove.o stdio/ferror.o stdio/fputs.o stdlib/rand.o stdlib/srand.o unistd/getpid.o stdlib/strtoul.o stdio/fflush.o stdlib/abort.o string/strcspn.o time/localtime.o time/time.o time/clock_gettime.o time/gmtime.o time/strftime.o string/strpbrk.o ctype/isdigit.o ctype/isalpha.o ctype/isxdigit.o ctype/ispunct.o stdio/setvbuf.o stdio/fileno.o stdio/putc.o stdio/sprintf.o stdlib/abs.o string/strspn.o stdlib/qsort.o string/memmove.o setjmp/longjmp.o setjmp/setjmp.o libgen/basename.o string/strdup.o string/strndup.o string/strlcpy.o stdlib/atexit.o stdio/open_memstream.o libgen/dirname.o unistd/unlink.o string/strstr.o string/strcasecmp.o string/strncasecmp.o stdlib/mkstemp.o string/strtok.o unistd/execvp.o unistd/_exit.o ctype/isalnum.o time/ctime_r.o stdlib/strtold.o sys/time/gettimeofday.o stdio/fgetpos.o stdio/fsetpos.o ctype/isprint.o stdlib/system.o stdio/tmpnam.o unistd/msleep.o stdlib/atof.o stdlib/strtod.o stdio/rename.o sys/stat/mkdir.o unistd/uptime.o unistd/ftruncate.o sys/socket/recvfrom.o sys/socket/sendto.o signal/kill.o signal/sigaction.o unistd/chdir.o unistd/getcwd.o stdio/getdelim.o stdio/getline.o unistd/isatty.o sys/socket/listen.o stdlib/realpath.o systemcall.o sys/random/randomfill.o fcntl/open.o unistd/write.o unistd/pwrite.o fcntl/open_process.o tb/sb.o tb/sv.o string/memchr.o stdlib/atol.o stdlib/atoll.o stdlib/strtoll.o sys/stat/fstat.o unistd/lseek.o ctype/isupper.o ctype/islower.o ctype/isblank.o ctype/isgraph.o ctype/iscntrl.o math/ldexp.o sys/socket/connect.o sys/socket/setsockopt.o arpa/inet/ntohl.o arpa/inet/ntohs.o netdb/getaddrinfo.o tb/sha1.o sys/socket/getpeername.o
 all: libc.a
 
 %.o: %.c
diff --git a/userland/libc/include/syscall.h b/userland/libc/include/syscall.h
index 1f68b60..fee2e43 100644
--- a/userland/libc/include/syscall.h
+++ b/userland/libc/include/syscall.h
@@ -45,6 +45,7 @@
 #define SYS_LSEEK 37
 #define SYS_CONNECT 38
 #define SYS_SETSOCKOPT 39
+#define SYS_GETPEERNAME 40
 
 int syscall(uint32_t eax, uint32_t ebx, uint32_t ecx, uint32_t edx,
             uint32_t esi, uint32_t edi);
diff --git a/userland/libc/stdio/vfprintf.c b/userland/libc/stdio/vfprintf.c
index 7006578..2ba3e2c 100644
--- a/userland/libc/stdio/vfprintf.c
+++ b/userland/libc/stdio/vfprintf.c
@@ -10,7 +10,7 @@ const char HEX_SET[0x10] = {'0', '1', '2', '3', '4', '5', '6', '7',
 #define FILE_WRITE(_f, _s, _l, _r)                                             \
   {                                                                            \
     size_t _rc = _f->write(_f, (const unsigned char *)_s, _l);                 \
-    if ((size_t)-1 == _rc)                                                     \
+    if ((size_t) - 1 == _rc)                                                   \
       assert(0);                                                               \
     *(int *)(_r) += _rc;                                                       \
   }
@@ -18,10 +18,6 @@ const char HEX_SET[0x10] = {'0', '1', '2', '3', '4', '5', '6', '7',
 int fprint_num(FILE *f, long long n, int base, char *char_set, int prefix,
                int zero_padding, int right_padding) {
   int c = 0;
-  if (0 == n) {
-    zero_padding = 1;
-    prefix = 1;
-  }
   char str[32];
   int i = 0;
 
diff --git a/userland/libc/sys/socket/getpeername.c b/userland/libc/sys/socket/getpeername.c
new file mode 100644
index 0000000..25a56b1
--- /dev/null
+++ b/userland/libc/sys/socket/getpeername.c
@@ -0,0 +1,7 @@
+#include <sys/socket.h>
+#include <syscall.h>
+
+int getpeername(int sockfd, struct sockaddr *restrict addr,
+                socklen_t *restrict addrlen) {
+  RC_ERRNO(syscall(SYS_GETPEERNAME, sockfd, addr, addrlen, 0, 0));
+}
diff --git a/userland/test/test.c b/userland/test/test.c
index 9013f1e..29aa34c 100644
--- a/userland/test/test.c
+++ b/userland/test/test.c
@@ -578,6 +578,8 @@ void printf_test(void) {
     EXP("hex: 1");
     buf_n = sprintf(buf, "hex: %x", 0x622933f2);
     EXP("hex: 622933f2");
+    buf_n = sprintf(buf, "hex: %02x", 0);
+    EXP("hex: 00");
 
     buf_n = sprintf(buf, "oct: %02o", 1);
     EXP("oct: 01");