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sprintf writes to a string buffer instead of standard output. snprintf provides a level of safety over sprintf since the caller provides a length (n) parameter that specifies the maximum number or chars to write to the buffer. For most printf-family functions, there is a variant that accepts va_list rather
The C programming language provides many standard library functions for file input and output.These functions make up the bulk of the C standard library header <stdio.h>. [1] The functionality descends from a "portable I/O package" written by Mike Lesk at Bell Labs in the early 1970s, [2] and officially became part of the Unix operating system in Version 7.
The audit uncovered an snprintf that directly passed user-generated data without a format string. Extensive tests with contrived arguments to printf-style functions showed that use of this for privilege escalation was possible.
This article describes the calling conventions used when programming x86 architecture microprocessors.. Calling conventions describe the interface of called code: The order in which atomic (scalar) parameters, or individual parts of a complex parameter, are allocated
printf(string format, items-to-format) It can take one or more arguments, where the first argument is a string to be written. This string can contain special formatting codes which are replaced by items from the remainder of the arguments. For example, an integer can be printed using the "%d" formatting code, e.g.: printf("%d", 42);
I suggest renaming this whole topic to Formatted output or some similar name and removing all the discussion on printf-specific format flags instead showing a few different ways of specifying flags - like Common Lisp's tilde-character vs C's percent-width-flags. A link to the specification of printf (such as the SUSv3 link at the bottom) should ...
Two types of literal expression are usually offered: one with interpolation enabled, the other without. Non-interpolated strings may also escape sequences, in which case they are termed a raw string, though in other cases this is separate, yielding three classes of raw string, non-interpolated (but escaped) string, interpolated (and escaped) string.
A common use case is in constructing printf or scanf format strings, where format specifiers are given by macros. [ 18 ] [ 19 ] A more complex example uses stringification of integers (by the preprocessor) to define a macro that expands to a sequence of string literals, which are then concatenated to a single string literal with the file name ...