HARDWARE/SOFTWARE INFO
- Hardware: NUCLEO-WB55RG Dev Board Device Page
- STM32CubeIDE: Version: 1.13.0
Build: 17399_20230707_0829 (UTC) - GGC Assembler All Options: -mcpu=cortex-m4 -g3 -c -x assembler-with-cpp -mfpu=fpv4-sp-d16 -mfloat-abi=hard -mthumb
- GCC Compiler All Options: -mcpu=cortex-m4 -std=gnu11 -g3 -DUSE_HAL_DRIVER -DDEBUG -DSTM32WB55xx -c -I../../Drivers/BSP/P-NUCLEO-WB55.Nucleo -I../../Drivers/CMSIS/Device/ST/STM32WBxx/Include -I../../Drivers/STM32WBxx_HAL_Driver/Inc/Legacy -I../../Drivers/STM32WBxx_HAL_Driver/Inc -I../../Inc -I../../Drivers/CMSIS/Include -O0 -ffunction-sections -fdata-sections -Wall -fstack-usage -fcyclomatic-complexity -mfpu=fpv4-sp-d16 -mfloat-abi=hard -mthumb
- GCC Linker All Options: -mcpu=cortex-m4 -T"C:\Users\myname\STM32Cube\Example\UART_Printf\STM32CubeIDE\STM32WB55RGVX_FLASH.ld" --specs=nosys.specs -Wl,-Map="${BuildArtifactFileBaseName}.map" -Wl,--gc-sections -static -mfpu=fpv4-sp-d16 -mfloat-abi=hard -mthumb -Wl,--start-group -lc -lm -Wl,--end-group
ISSUE DESCRIPTION
I am writing some code that involves building a string and saving it to a char array using snprintf, then later on saving that string to a char pointer. The string being created will always have an ASCII '%' symbol in it.
Essentially I have found that the running the example code below results in the percent symbol being formatted correctly in the char array string (src_msg), but the formatting changes to be incorrect after I use snprintf to copy the string from the array to the char pointer (dest_msg).
Any ideas why this is happening or how to fix it?
int main(void)
{
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_USART1_UART_Init();
printf("Boot!\r\n");
HAL_Delay(2000);
char src_msg[150];
char * dest_msg = malloc(sizeof(char) * 150);
snprintf(src_msg, 150, ",%u%% %u,", 97, 2);
snprintf(dest_msg, 150, src_msg);
printf("Source Message: %s\r\n", src_msg);
printf("\r\n");
printf("Dest Message: %s\r\n", dest_msg);
}
Boot!
Boot!
Source Message: ,97% 2,
Dest Message: ,97 ,
