124 lines
4.3 KiB
C
124 lines
4.3 KiB
C
///////////////////////////////////////////////////////////////////////////////
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//
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/// \file util.h
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/// \brief Miscellaneous utility functions
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//
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// Author: Lasse Collin
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//
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// This file has been put into the public domain.
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// You can do whatever you want with this file.
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//
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///////////////////////////////////////////////////////////////////////////////
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/// \brief Safe malloc() that never returns NULL
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///
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/// \note xmalloc(), xrealloc(), and xstrdup() must not be used when
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/// there are files open for writing, that should be cleaned up
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/// before exiting.
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#define xmalloc(size) xrealloc(NULL, size)
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/// \brief Safe realloc() that never returns NULL
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extern void *xrealloc(void *ptr, size_t size)
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lzma_attribute((__malloc__)) lzma_attr_alloc_size(2);
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/// \brief Safe strdup() that never returns NULL
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extern char *xstrdup(const char *src) lzma_attribute((__malloc__));
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/// \brief Fancy version of strtoull()
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///
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/// \param name Name of the option to show in case of an error
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/// \param value String containing the number to be parsed; may
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/// contain suffixes "k", "M", "G", "Ki", "Mi", or "Gi"
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/// \param min Minimum valid value
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/// \param max Maximum valid value
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///
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/// \return Parsed value that is in the range [min, max]. Does not return
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/// if an error occurs.
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///
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extern uint64_t str_to_uint64(const char *name, const char *value,
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uint64_t min, uint64_t max);
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/// \brief Round an integer up to the next full MiB and convert to MiB
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///
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/// This is used when printing memory usage and limit.
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extern uint64_t round_up_to_mib(uint64_t n);
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/// \brief Convert uint64_t to a string
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///
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/// Convert the given value to a string with locale-specific thousand
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/// separators, if supported by the snprintf() implementation. The string
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/// is stored into an internal static buffer indicated by the slot argument.
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/// A pointer to the selected buffer is returned.
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///
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/// This function exists, because non-POSIX systems don't support thousand
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/// separator in format strings. Solving the problem in a simple way doesn't
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/// work, because it breaks gettext (specifically, the xgettext tool).
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extern const char *uint64_to_str(uint64_t value, uint32_t slot);
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enum nicestr_unit {
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NICESTR_B,
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NICESTR_KIB,
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NICESTR_MIB,
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NICESTR_GIB,
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NICESTR_TIB,
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};
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/// \brief Convert uint64_t to a nice human readable string
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///
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/// This is like uint64_to_str() but uses B, KiB, MiB, GiB, or TiB suffix
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/// and optionally includes the exact size in parenthesis.
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///
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/// \param value Value to be printed
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/// \param unit_min Smallest unit to use. This and unit_max are used
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/// e.g. when showing the progress indicator to force
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/// the unit to MiB.
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/// \param unit_max Biggest unit to use. assert(unit_min <= unit_max).
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/// \param always_also_bytes
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/// Show also the exact byte value in parenthesis
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/// if the nicely formatted string uses bigger unit
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/// than bytes.
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/// \param slot Which static buffer to use to hold the string.
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/// This is shared with uint64_to_str().
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///
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/// \return Pointer to statically allocated buffer containing the string.
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///
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/// \note This uses double_to_str() internally so the static buffer
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/// in double_to_str() will be overwritten.
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///
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extern const char *uint64_to_nicestr(uint64_t value,
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enum nicestr_unit unit_min, enum nicestr_unit unit_max,
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bool always_also_bytes, uint32_t slot);
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/// \brief Wrapper for snprintf() to help constructing a string in pieces
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///
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/// A maximum of *left bytes is written starting from *pos. *pos and *left
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/// are updated accordingly.
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extern void my_snprintf(char **pos, size_t *left, const char *fmt, ...)
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lzma_attribute((__format__(__printf__, 3, 4)));
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/// \brief Check if filename is empty and print an error message
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extern bool is_empty_filename(const char *filename);
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/// \brief Test if stdin is a terminal
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///
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/// If stdin is a terminal, an error message is printed and exit status set
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/// to EXIT_ERROR.
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extern bool is_tty_stdin(void);
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/// \brief Test if stdout is a terminal
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///
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/// If stdout is a terminal, an error message is printed and exit status set
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/// to EXIT_ERROR.
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extern bool is_tty_stdout(void);
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