Hi I meet a problem with sscanf(), I want to use this function to parse string into number. But I found the neither uint16_t nor uint8_t could work with %d. Here is the sample code: #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdint.h> int main(int argc, char **argv) { uint8_t num1; uint16_t num2; uint32_t num3; sscanf("10", "%d", &num1); sscanf("10", "%d", &num2); sscanf("10", "%d", &num3); printf("input number is %d %d %d\n", num1, num2, num3); return 0; } input number is 0 0 10 But if it is built with glibc at x86_64, the result would be: input number is 0 10 10 I have no idea why the uint8_t doesn't work, but why the uint16_t doesn't work? Here is the config of uclibc, from openwrt # # Automatically generated make config: don't edit # Version: 0.9.33.2 # Sun Mar 20 17:05:37 2016 # # TARGET_alpha is not set # TARGET_arm is not set # TARGET_avr32 is not set # TARGET_bfin is not set # TARGET_c6x is not set # TARGET_cris is not set # TARGET_e1 is not set # TARGET_frv is not set # TARGET_h8300 is not set # TARGET_hppa is not set # TARGET_i386 is not set # TARGET_i960 is not set # TARGET_ia64 is not set # TARGET_m68k is not set # TARGET_microblaze is not set TARGET_mips=y # TARGET_nios is not set # TARGET_nios2 is not set # TARGET_powerpc is not set # TARGET_sh is not set # TARGET_sh64 is not set # TARGET_sparc is not set # TARGET_v850 is not set # TARGET_vax is not set # TARGET_x86_64 is not set # TARGET_xtensa is not set # # Target Architecture Features and Options # TARGET_ARCH="mips" FORCE_OPTIONS_FOR_ARCH=y CONFIG_MIPS_O32_ABI=y # CONFIG_MIPS_N32_ABI is not set # CONFIG_MIPS_N64_ABI is not set # CONFIG_MIPS_ISA_1 is not set # CONFIG_MIPS_ISA_2 is not set # CONFIG_MIPS_ISA_3 is not set # CONFIG_MIPS_ISA_4 is not set CONFIG_MIPS_ISA_MIPS32=y # CONFIG_MIPS_ISA_MIPS32R2 is not set # CONFIG_MIPS_ISA_MIPS64 is not set TARGET_SUBARCH="" # # Using ELF file format # ARCH_ANY_ENDIAN=y ARCH_BIG_ENDIAN=y ARCH_WANTS_BIG_ENDIAN=y # ARCH_WANTS_LITTLE_ENDIAN is not set ARCH_HAS_MMU=y ARCH_USE_MMU=y UCLIBC_HAS_FLOATS=y # UCLIBC_HAS_FPU is not set UCLIBC_HAS_SOFT_FLOAT=y DO_C99_MATH=y # DO_XSI_MATH is not set # UCLIBC_HAS_FENV is not set KERNEL_HEADERS="/home/ayaka/src/openwrt/chaos_calmer/build_dir/toolchain-mips_34kc_gcc-4.8-linaro_uClibc-0.9.33.2/linux-dev/include" HAVE_DOT_CONFIG=y # # General Library Settings # DOPIC=y HAVE_SHARED=y # FORCE_SHAREABLE_TEXT_SEGMENTS is not set LDSO_LDD_SUPPORT=y LDSO_CACHE_SUPPORT=y LDSO_PRELOAD_ENV_SUPPORT=y # LDSO_PRELOAD_FILE_SUPPORT is not set LDSO_BASE_FILENAME="ld.so" # LDSO_STANDALONE_SUPPORT is not set # LDSO_PRELINK_SUPPORT is not set # UCLIBC_STATIC_LDCONFIG is not set LDSO_RUNPATH=y # LDSO_SEARCH_INTERP_PATH is not set LDSO_LD_LIBRARY_PATH=y # LDSO_NO_CLEANUP is not set UCLIBC_CTOR_DTOR=y # LDSO_GNU_HASH_SUPPORT is not set # HAS_NO_THREADS is not set # LINUXTHREADS_OLD is not set # LINUXTHREADS_NEW is not set UCLIBC_HAS_THREADS_NATIVE=y UCLIBC_HAS_THREADS=y UCLIBC_HAS_TLS=y PTHREADS_DEBUG_SUPPORT=y UCLIBC_HAS_SYSLOG=y UCLIBC_HAS_LFS=y # MALLOC is not set # MALLOC_SIMPLE is not set MALLOC_STANDARD=y MALLOC_GLIBC_COMPAT=y UCLIBC_DYNAMIC_ATEXIT=y # COMPAT_ATEXIT is not set UCLIBC_SUSV3_LEGACY=y UCLIBC_SUSV3_LEGACY_MACROS=y UCLIBC_SUSV4_LEGACY=y # UCLIBC_STRICT_HEADERS is not set # UCLIBC_HAS_STUBS is not set UCLIBC_HAS_SHADOW=y UCLIBC_HAS_PROGRAM_INVOCATION_NAME=y UCLIBC_HAS___PROGNAME=y UCLIBC_HAS_PTY=y ASSUME_DEVPTS=y # UNIX98PTY_ONLY is not set UCLIBC_HAS_GETPT=y UCLIBC_HAS_LIBUTIL=y UCLIBC_HAS_TM_EXTENSIONS=y UCLIBC_HAS_TZ_CACHING=y UCLIBC_HAS_TZ_FILE=y UCLIBC_HAS_TZ_FILE_READ_MANY=y UCLIBC_TZ_FILE_PATH="/etc/TZ" # UCLIBC_FALLBACK_TO_ETC_LOCALTIME is not set # # Advanced Library Settings # UCLIBC_PWD_BUFFER_SIZE=256 UCLIBC_GRP_BUFFER_SIZE=256 # # Support various families of functions # UCLIBC_LINUX_MODULE_26=y # UCLIBC_LINUX_MODULE_24 is not set UCLIBC_LINUX_SPECIFIC=y UCLIBC_HAS_GNU_ERROR=y UCLIBC_BSD_SPECIFIC=y UCLIBC_HAS_BSD_ERR=y # UCLIBC_HAS_OBSOLETE_BSD_SIGNAL is not set # UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL is not set # UCLIBC_NTP_LEGACY is not set # UCLIBC_SV4_DEPRECATED is not set UCLIBC_HAS_REALTIME=y UCLIBC_HAS_ADVANCED_REALTIME=y UCLIBC_HAS_EPOLL=y # UCLIBC_HAS_XATTR is not set # UCLIBC_HAS_PROFILING is not set UCLIBC_HAS_CRYPT_IMPL=y # UCLIBC_HAS_SHA256_CRYPT_IMPL is not set # UCLIBC_HAS_SHA512_CRYPT_IMPL is not set UCLIBC_HAS_CRYPT=y UCLIBC_HAS_NETWORK_SUPPORT=y UCLIBC_HAS_SOCKET=y UCLIBC_HAS_IPV4=y UCLIBC_HAS_IPV6=y # UCLIBC_HAS_RPC is not set UCLIBC_USE_NETLINK=y UCLIBC_SUPPORT_AI_ADDRCONFIG=y UCLIBC_HAS_BSD_RES_CLOSE=y UCLIBC_HAS_COMPAT_RES_STATE=y # UCLIBC_HAS_EXTRA_COMPAT_RES_STATE is not set UCLIBC_HAS_RESOLVER_SUPPORT=y UCLIBC_HAS_LIBRESOLV_STUB=y UCLIBC_HAS_LIBNSL_STUB=y # # String and Stdio Support # UCLIBC_HAS_STRING_GENERIC_OPT=y UCLIBC_HAS_STRING_ARCH_OPT=y UCLIBC_HAS_CTYPE_TABLES=y UCLIBC_HAS_CTYPE_SIGNED=y # UCLIBC_HAS_CTYPE_UNSAFE is not set UCLIBC_HAS_CTYPE_CHECKED=y # UCLIBC_HAS_CTYPE_ENFORCED is not set UCLIBC_HAS_WCHAR=y # UCLIBC_HAS_LOCALE is not set UCLIBC_HAS_HEXADECIMAL_FLOATS=y UCLIBC_HAS_GLIBC_CUSTOM_PRINTF=y UCLIBC_PRINTF_SCANF_POSITIONAL_ARGS=9 # UCLIBC_HAS_STDIO_BUFSIZ_NONE is not set # UCLIBC_HAS_STDIO_BUFSIZ_256 is not set # UCLIBC_HAS_STDIO_BUFSIZ_512 is not set # UCLIBC_HAS_STDIO_BUFSIZ_1024 is not set # UCLIBC_HAS_STDIO_BUFSIZ_2048 is not set UCLIBC_HAS_STDIO_BUFSIZ_4096=y # UCLIBC_HAS_STDIO_BUFSIZ_8192 is not set UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE=y # UCLIBC_HAS_STDIO_BUILTIN_BUFFER_4 is not set # UCLIBC_HAS_STDIO_BUILTIN_BUFFER_8 is not set # UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT is not set UCLIBC_HAS_STDIO_GETC_MACRO=y UCLIBC_HAS_STDIO_PUTC_MACRO=y UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION=y # UCLIBC_HAS_FOPEN_LARGEFILE_MODE is not set UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE=y # UCLIBC_HAS_FOPEN_CLOSEEXEC_MODE is not set UCLIBC_HAS_GLIBC_CUSTOM_STREAMS=y UCLIBC_HAS_PRINTF_M_SPEC=y UCLIBC_HAS_ERRNO_MESSAGES=y # UCLIBC_HAS_SYS_ERRLIST is not set UCLIBC_HAS_SIGNUM_MESSAGES=y # UCLIBC_HAS_SYS_SIGLIST is not set UCLIBC_HAS_GNU_GETOPT=y UCLIBC_HAS_STDIO_FUTEXES=y UCLIBC_HAS_GNU_GETSUBOPT=y # # Big and Tall # UCLIBC_HAS_REGEX=y UCLIBC_HAS_REGEX_OLD=y UCLIBC_HAS_FNMATCH=y UCLIBC_HAS_FNMATCH_OLD=y UCLIBC_HAS_WORDEXP=y UCLIBC_HAS_NFTW=y UCLIBC_HAS_FTW=y UCLIBC_HAS_FTS=y UCLIBC_HAS_GLOB=y UCLIBC_HAS_GNU_GLOB=y # UCLIBC_HAS_UTMPX is not set # # Library Installation Options # RUNTIME_PREFIX="/" DEVEL_PREFIX="/usr/" MULTILIB_DIR="lib" # HARDWIRED_ABSPATH is not set # # Security options # # UCLIBC_BUILD_PIE is not set # UCLIBC_HAS_ARC4RANDOM is not set # UCLIBC_HAS_SSP is not set UCLIBC_BUILD_RELRO=y # UCLIBC_BUILD_NOW is not set UCLIBC_BUILD_NOEXECSTACK=y # # Development/debugging options # CROSS_COMPILER_PREFIX="" UCLIBC_EXTRA_CFLAGS="" # DODEBUG is not set DOSTRIP=y # DOASSERTS is not set # SUPPORT_LD_DEBUG is not set # SUPPORT_LD_DEBUG_EARLY is not set # UCLIBC_MALLOC_DEBUGGING is not set # UCLIBC_HAS_BACKTRACE is not set WARNINGS="-Wall" # EXTRA_WARNINGS is not set # DOMULTI is not set # UCLIBC_MJN3_ONLY is not set