va_list returns something wrong

[elektron314]

Hi! I have very strange behaviour of my code. I don't undestand where is the problem.
Here I have vprintf-like function by wich I substitute output of in ESP_LOGe in

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1. esp_log_set_vprintf(vprintf_like_t_sw_uart_write);

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This is implementation

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1. int vprintf_like_t_sw_uart_write(const char *format, va_list args)
2. {
3.     char buffer[100];
4.     sprintf(buffer, format, args);
5.     return sw_uart_write(buffer);
6. }

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Where sw_uart_write is my own function that create one more software uart (bitbanging).
So if I write e.g.

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1. arg = 0;
2. ESP_LOGE("TAG", "esp_loge test %d", arg);

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I see this in my software uart output:

esp_loge test 12

Whatever put instead of arg I always get 12.
What can be wrong?
My sw_uart_write works ok. It's just simple bitbanging.

[elektron314]

UPDATE:
even this function being set as esp_log_set_vprintf(vprintf_like); always transform my args to int 12

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1. int vprintf_like(const char *format, va_list args)
2. {
3.     return printf(format, args);
4. }

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[elektron314]

Somebody help me.

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1. esp_log_set_vprintf(printf);

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transforms arguments to int 12
usage:

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1. ESP_LOGE("TAG", "??? main -----------%d",999);

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results in printing

??? main -----------12

[boarchuz]

You can't forward the va_list to sprintf. Try vsprintf.

[elektron314]

You can't forward the va_list to sprintf. Try vsprintf.

Thanks! It works, you are right!