VSNPRINTF - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Basic C Library Functions

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NAMEvsnprintf − Format a string and place it in a buffer

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SYNOPSISint vsnprintf(char * buf, size_t size, const char * fmt, va_list args);

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ARGUMENTSbuf The buffer to place the result into size The size of the buffer, including the trailing null space fmt The format string to use args Arguments for the format string

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DESCRIPTIONThis function follows C99 vsnprintf, but has some extensions: pS output the name of a text symbol with offset ps output the name of a text symbol without offset pF output the name of a function pointer with its offset pf output the name of a function pointer without its offset pR output the address range in a struct resource pIS depending on sa_family of ´struct sockaddr *´ print IPv4/IPv6 address piS depending on sa_family of ´struct sockaddr *´ print IPv4/IPv6 address %*ph[CDN] a variable−length hex string with a separator (supports up to 64 bytes of the input) n is ignored The return value is the number of characters which would be generated for the given input, excluding the trailing ´\0´, as per ISO C99​. If you want to have the exact number of characters written into buf as return value (not including the trailing ´\0´), use vscnprintf​. If the return is greater than or equal to size, the resulting string is truncated​. Call this function if you are already dealing with a va_list​. You probably want snprintf instead​.

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