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+libsimple.h includes most POSIX header files so you do need to include lots of
+headers in your code, and defines macros and functions that are useful for most
+programs and libraries to simplify the code. It also provides *_MIN and *_MAX
+values for integer data types.
+
+Most functions are namespaced with `libsimple_` and aliased with macro
+definitions to unnamespaced names unless there already is a macro with that
+name.
+
+Programs using this library should define `char *argv0` and set it to
+the 0:th command line argument.
+
+
+
+CLOCK_MONOTONIC_RAW is defined to CLOCK_MONOTONIC unless CLOCK_MONOTONIC_RAW
+already exists.
+
+AF_LOCAL, AF_UNIX, AF_FILE, PF_LOCAL, PF_UNIX, and PF_FILE are defined to
+appropriate values provided that AF_LOCAL, AF_UNIX, or AF_FILE is already
+defined.
+
+The following macros are defined, unless already defined:
+
+ MIN(A, B)
+ Select the least of two values.
+
+ MAX(A, B)
+ Select the greatest of two values.
+
+ MIN3(A, B, C)
+ Select the least of three values.
+
+ MAX3(A, B, C)
+ Select the greatest of three values.
+
+ ELEMSOF(ARR)
+ Gets the number of elements in an array.
+
+ STRLEN(STR)
+ Gets the length of a string literal.
+
+ INTSTRLEN(TYPE)
+ Gets the maximum length any value with the integer type TYPE can
+ have in base 10.
+
+ TYPE_MAX(TYPE)
+ Get the greatest value storable in an integer type.
+
+ TYPE_MIN(TYPE)
+ Get the least value storable in an integer type.
+
+ FREE(PTR)
+ (free(PTR), (PTR) = NULL, 0)
+ Ensures that a pointer is not freed twiced.
+
+ CLOSE(FD)
+ ((FD) >= 0 ? (close(FD), (FD) = -1, 0) : 0)
+ Ensures that errno is not modified when closing an
+ already closed file descriptor.
+
+ Maximum values:
+ BLKCNT64_MAX, BLKCNT_MAX, BLKSIZE_MAX, CC_MAX, CLOCKID_MAX,
+ CLOCK_MAX, DEV_MAX, FSBLKCNT64_MAX, FSBLKCNT_MAX,
+ FSFILCNT64_MAX, FSFILCNT_MAX, FSID_MAX, FSWORD_MAX, GID_MAX,
+ ID_MAX, INO64_MAX, INO_MAX, KEY_MAX, LOFF_MAX, MODE_MAX,
+ NLINK_MAX, OFF64_MAX, OFF_MAX, PID_MAX, QUAD_MAX, REGISTER_MAX,
+ RLIM64_MAX, RLIM_MAX, SOCKLEN_MAX, SPEED_MAX, SUSECONDS_MAX,
+ TCFLAG_MAX, TIMER_MAX, TIME_MAX, UID_MAX, USECONDS_MAX,
+ U_QUAD_MAX
+
+ Minimum values:
+ BLKCNT64_MIN, BLKCNT_MIN, BLKSIZE_MIN, CC_MIN, CLOCKID_MIN,
+ CLOCK_MIN, DEV_MIN, FSBLKCNT64_MIN, FSBLKCNT_MIN,
+ FSFILCNT64_MIN, FSFILCNT_MIN, FSID_MIN, FSWORD_MIN, GID_MIN,
+ ID_MIN, INO64_MIN, INO_MIN, KEY_MIN, LOFF_MIN, MODE_MIN,
+ NLINK_MIN, OFF64_MIN, OFF_MIN, PID_MIN, QUAD_MIN, REGISTER_MIN,
+ RLIM64_MIN, RLIM_MIN, SOCKLEN_MIN, SPEED_MIN, SUSECONDS_MIN,
+ TCFLAG_MIN, TIMER_MIN, TIME_MIN, UID_MIN, USECONDS_MIN,
+ U_QUAD_MIN
+
+The following functions are defined (some as inline functions):
+
+ void *libsimple_rawmemchr(const void *, int)
+ Memchr without boundary check.
+
+ void *libsimple_memrchr(const void *, int, size_t)
+ Like memchr, except finds the last occurrence.
+
+ void *libsimple_rawmemrchr(const void *, int, size_t)
+ libsimple_memrchr without boundary check.
+
+ char *libsimple_strchrnul(const char *, int)
+ Like strchr, except returns the end if not found.
+
+ char *libsimple_strend(const char *s)
+ strchr(s, '\0')
+
+ char *libsimple_inchrset(int c, const char *s)
+ c && strchr(s, c)
+
+ void *libsimple_memdup(const void *, size_t)
+ Duplicate a memory segment.
+
+ char *libsimple_strndup(const char *, size_t)
+ Duplicate a substring.
+
+ void *libsimple_mempcpy(void *, const void *, size_t)
+ Like memcpy, except returns the byte after the
+ last written byte.
+
+ int libsimple_isutf8(const char *s, int allow_modified_nul)
+ Returns 1 if `s` is valid UTF-8 (Unicode codepoints are not
+ validated) and 0 otherwise. If `allow_modified_nul` is non-zero,
+ the byte sequence 0xC0 0x80 is allowed.
+
+ int libsimple_asprintf(char **, const char *, ...)
+ Like sprintf accept allocated the buffer.
+
+ int libsimple_vasprintf(char **, const char *, va_list);
+ Like vsprintf accept allocated the buffer.
+
+ void *libsimple_memmem(const void *s, size_t sn, const void *t, size_t tn)
+ Finds the first occurrence of `t` in `s`.
+ Length of `s` is `sn`. Length of `t` is `tn`.
+
+ int libsimple_memstarts(const void *s, size_t sn, const void *t, size_t tn)
+ Returns 1 if `s` starts with `t`, 0 otherwise.
+ Length of `s` is `sn`. Length of `t` is `tn`.
+
+ int libsimple_memends(const void *s, size_t sn, const void *t, size_t tn)
+ Returns 1 if `s` ends with `t`, 0 otherwise.
+ Length of `s` is `sn`. Length of `t` is `tn`.
+
+ int libsimple_strstarts(const char *s, const char *t)
+ Returns 1 if `s` starts with `t`, 0 otherwise.
+
+ int libsimple_strcasestarts(const char *, const char *)
+ Like strstarts except case-insensitive.
+
+ int libsimple_strends(const char *s, const char *t)
+ Returns 1 if `s` ends with `t`, 0 otherwise.
+
+ int libsimple_strcaseends(const char *, const char *)
+ Like strends except case-insensitive.
+
+ char *libsimple_strcasestr(const char *, const char *)
+ Like strstr except case-insensitive.
+
+ int libsimple_streq(const char *a, const char *b)
+ !strncmp(a, b)
+
+ int libsimple_strneq(const char *a, const char *b, size_t n)
+ !strncmp(a, b, n)
+
+ char *getenv_ne(const char *)
+ Like getenv, except returns NULL if the value
+ of the environment variable is the empty string.
+
+ int putenvf(const char *, ...)
+ Format a string a call putenv.
+
+ int vputenvf(const char *, va_list)
+ Format a string a call putenv.
+
+ int libsimple_sendfd(int sock, int fd)
+ Send a file descriptor over a socket.
+
+ int libsimple_recvfd(int sock)
+ Receive a file descriptor over a socket.
+
+ ssize_t libsimple_recvfrom_timestamped(int, void *restrict, size_t, int,
+ struct sockaddr *restrict, socklen_t, struct timespec *restrict)
+ Like recvfrom except also returns the a SCM_TIMESTAMP or
+ SCM_TIMESTAMPNS timestamp, returns zero as the timestamp
+ if missing.
+
+ ssize_t libsimple_recv_timestamped(int, void *restrict, size_t, int,
+ struct timespec *restrict)
+ Like recv except also returns the a SCM_TIMESTAMP or
+ SCM_TIMESTAMPNS timestamp, returns zero as the timestamp
+ if missing.
+
+ int libsimple_sumtimespec(struct timespec *, const struct timespec *,
+ const struct timespec *)
+ Returns the sum of two timestamps.
+
+ int libsimple_difftimespec(struct timespec *, const struct timespec *,
+ const struct timespec *)
+ Returns the difference of two timestamps.
+
+ int libsimple_multimespec(struct timespec *, const struct timespec *, int)
+ Multiplies a timestamp with an integer.
+
+ int libsimple_cmptimespec(const struct timespec *, const struct timespec *)
+ Compares two timestamps, same return semantics as strcmp.
+
+ int libsimple_sumtimeval(struct timeval *, const struct timeval *,
+ const struct timeval *)
+ Returns the sum of two timestamps.
+
+ int libsimple_difftimeval(struct timeval *, const struct timeval *,
+ const struct timeval *)
+ Returns the difference of two timestamps.
+
+ int libsimple_multimeval(struct timeval *, const struct timeval *, int)
+ Multiplies a timestamp with an integer.
+
+ int libsimple_cmptimeval(const struct timeval *, const struct timeval *)
+ Compares two timestamps, same return semantics as strcmp.
+
+ void libsimple_timeval2timespec(struct timespec *restrict,
+ const struct timeval *restrict)
+ Converts a struct timeval to a struct timespec.
+
+ int libsimple_timespec2timeval(struct timeval *restrict,
+ const struct timespec *restrict)
+ Converts a struct timespec to a struct timeval.
+
+ int libsimple_strtotimespec(struct timespec *restrict,
+ const char *restrict, char **restrict)
+ Converts a string to a struct timespec.
+
+ int libsimple_strtotimeval(struct timeval *restrict,
+ const char *restrict, char **restrict)
+ Converts a string to a struct timeval.
+
+ char *libsimple_timespectostr(char *restrict,
+ const struct timespec *restrict)
+ Converts a struct timespec to a string.
+
+ char *libsimple_timevaltostr(char *restrict,
+ const struct timeval *restrict)
+ Converts a struct timeval to a string.
+
+ double libsimple_timespectodouble(const struct timespec *)
+ Converts a struct timespec to a double.
+
+ double libsimple_timevaltodouble(const struct timeval *)
+ Converts a struct timeval to a double.
+
+ void libsimple_doubletotimespec(struct timespec *, double)
+ Converts a double to a struct timespec.
+
+ void libsimple_doubletotimeval(struct timeval *, double)
+ Converts a double to a struct timeval.
+
+ void libsimple_unlist(void *list, size_t i, size_t *np, size_t width)
+ Removes element `i` from the list `list`. `*np` shall be the
+ number of elements in the list, it will be updated by the
+ function. `width` shall be the byte-width of each element.
+
+ The macro LIBSIMPLE_UNLIST(LIST, I, NP) (alias to UNLIST if no
+ such macro already exists) is idential to libsimple_unlist
+ except `width` is automatically.
+
+ char *strdupa(const char *)
+ Like `strdup`, except the returned pointer is stack-allocated.
+ This function is implemented as a macro and is only available
+ when compiling with GCC or clang.
+
+ char *strndupa(const char *, size_t)
+ Like `strndup`, except the returned pointer is stack-allocated.
+ This function is implemented as a macro and is only available
+ when compiling with GCC or clang.
+
+ void *memdupa(const void *, size_t)
+ Like `memdup`, except the returned pointer is stack-allocated.
+ This function is implemented as a macro and is only available
+ when compiling with GCC or clang.
+
+ char *asprintfa(const char *, ...)
+ Like `asprintf` accept the the buffer is stack-allocated and
+ returned instead of stored in a pointer. This function is
+ implemented as a macro and is only available when compiling with
+ GCC or clang.
+
+ char *vasprintfa(const char *, va_list)
+ Like `vasprintf` accept the the buffer is stack-allocated and
+ returned instead of stored in a pointer. This function is
+ implemented as a macro and is only available when compiling with
+ GCC or clang.
+
+ void weprintf(const char *fmt, ...)
+ Similar to printf, except prints to stderr and:
+ * unless `fmt` starts with "usage: " the `argv` follow by
+ ": " is prepended to the printed string,
+ * if `fmt` ends with ":", " " followed by `strerror(errno)`
+ and "\n" and appended to the printed string, and
+ * if `fmt` does not end with ":" or "\n", "\n" and appended to
+ the printed string.
+
+ void vweprintf(const char *, va_list)
+ Identical to weprintf, except using va_list.
+
+ void eprintf(const char *fmt, ...)
+ Like weprintf, but calls exit(libsimple_default_failure_exit)
+ afterwards.
+
+ libsimple.h defines `extern int libsimple_default_failure_exit`.
+
+ void veprintf(const char *fmt, va_list)
+ Like veprintf, but calls exit(libsimple_default_failure_exit)
+ afterwards.
+
+ libsimple.h defines `extern int libsimple_default_failure_exit`.
+
+ void enprintf(int status, const char *, ...)
+ Like weprintf, but calls exit(stats) afterwards.
+
+ void venprintf(int status, const char *, va_list)
+ Like vweprintf, but calls exit(stats) afterwards.
+
+The following functions, which call `eprintf` on failure, are also defined:
+
+ void eputenvf(const char *, ...)
+ void evputenvf(const char *, va_list)
+ void *emalloc(size_t)
+ void *ecalloc(size_t, size_t)
+ void *erealloc(void *, size_t)
+ char *estrdup(const char *)
+ char *estrndup(const char *, size_t)
+ void *ememdup(const void *, size_t)
+
+The following functions, which call `enprintf` on failure, are also defined,
+the first argument is used as the first argument for `enprintf`:
+
+ void enputenvf(int, const char *, ...)
+ void envputenvf(int, const char *, va_list)
+ void *enmalloc(int, size_t)
+ void *encalloc(int, size_t, size_t)
+ void *enrealloc(int, void *, size_t)
+ char *enstrdup(int, const char *)
+ char *enstrndup(int, const char *, size_t)
+ void *enmemdup(int, const void *, size_t)