@c Edit the *.c files, configure with --enable-maintainer-mode,
@c and let gather-docs build you a new copy.
+@c safe-ctype.c:25
+@defvr Extension HOST_CHARSET
+This macro indicates the basic character set and encoding used by the
+host: more precisely, the encoding used for character constants in
+preprocessor @samp{#if} statements (the C "execution character set").
+It is defined by @file{safe-ctype.h}, and will be an integer constant
+with one of the following values:
+
+@ftable @code
+@item HOST_CHARSET_UNKNOWN
+The host character set is unknown - that is, not one of the next two
+possibilities.
+
+@item HOST_CHARSET_ASCII
+The host character set is ASCII.
+
+@item HOST_CHARSET_EBCDIC
+The host character set is some variant of EBCDIC. (Only one of the
+nineteen EBCDIC varying characters is tested; exercise caution.)
+@end ftable
+@end defvr
+
+@c pexecute.txh:1
+@deftypefn Extension struct pex_obj *pex_init (int @var{flags}, const char *@var{pname}, const char *@var{tempbase})
+
+Prepare to execute one or more programs, with standard output of each
+program fed to standard input of the next. This is a system
+independent interface to execute a pipeline.
+
+@var{flags} is a bitwise combination of the following:
+
+@table @code
+
+@vindex PEX_RECORD_TIMES
+@item PEX_RECORD_TIMES
+Record subprocess times if possible.
+
+@vindex PEX_USE_PIPES
+@item PEX_USE_PIPES
+Use pipes for communication between processes, if possible.
+
+@vindex PEX_SAVE_TEMPS
+@item PEX_SAVE_TEMPS
+Don't delete temporary files used for communication between
+processes.
+
+@end table
+
+@var{pname} is the name of program to be executed, used in error
+messages. @var{tempbase} is a base name to use for any required
+temporary files; it may be @code{NULL} to use a randomly chosen name.
+
+@end deftypefn
+
+@c pexecute.txh:161
+@deftypefn Extension const char *pex_one (int @var{flags}, const char *@var{executable}, char * const *@var{argv}, const char *@var{pname}, const char *@var{outname}, const char *@var{errname}, int *@var{status}, int *@var{err})
+
+An interface to @code{pex_init} to permit the easy execution of a
+single program. The return value and most of the parameters are as
+for a call to @code{pex_run}. @var{flags} is restricted to a
+combination of @code{PEX_SEARCH}, @code{PEX_STDERR_TO_STDOUT}, and
+@code{PEX_BINARY_OUTPUT}. @var{outname} is interpreted as if
+@code{PEX_LAST} were set. On a successful return, *@var{status} will
+be set to the exit status of the program.
+
+@end deftypefn
+
+@c pexecute.txh:32
+@deftypefn Extension const char *pex_run (struct pex_obj *@var{obj}, int @var{flags}, const char *@var{executable}, char * const *@var{argv}, const char *@var{outname}, const char *@var{errname}, int *@var{err})
+
+Execute one program in a pipeline. On success this returns
+@code{NULL}. On failure it returns an error message, a statically
+allocated string.
+
+@var{obj} is returned by a previous call to @code{pex_init}.
+
+@var{flags} is a bitwise combination of the following:
+
+@table @code
+
+@vindex PEX_LAST
+@item PEX_LAST
+This must be set on the last program in the pipeline. In particular,
+it should be set when executing a single program. The standard output
+of the program will be sent to @var{outname}, or, if @var{outname} is
+@code{NULL}, to the standard output of the calling program. This
+should not be set if you want to call @code{pex_read_output}
+(described below). After a call to @code{pex_run} with this bit set,
+@var{pex_run} may no longer be called with the same @var{obj}.
+
+@vindex PEX_SEARCH
+@item PEX_SEARCH
+Search for the program using the user's executable search path.
+
+@vindex PEX_SUFFIX
+@item PEX_SUFFIX
+@var{outname} is a suffix. See the description of @var{outname},
+below.
+
+@vindex PEX_STDERR_TO_STDOUT
+@item PEX_STDERR_TO_STDOUT
+Send the program's standard error to standard output, if possible.
+
+@vindex PEX_BINARY_INPUT
+@vindex PEX_BINARY_OUTPUT
+@item PEX_BINARY_INPUT
+@itemx PEX_BINARY_OUTPUT
+The standard input (output) of the program should be read (written) in
+binary mode rather than text mode. These flags are ignored on systems
+which do not distinguish binary mode and text mode, such as Unix. For
+proper behavior these flags should match appropriately--a call to
+@code{pex_run} using @code{PEX_BINARY_OUTPUT} should be followed by a
+call using @code{PEX_BINARY_INPUT}.
+@end table
+
+@var{executable} is the program to execute. @var{argv} is the set of
+arguments to pass to the program; normally @code{@var{argv}[0]} will
+be a copy of @var{executable}.
+
+@var{outname} is used to set the name of the file to use for standard
+output. There are two cases in which no output file will be used: 1)
+if @code{PEX_LAST} is not set in @var{flags}, and @code{PEX_USE_PIPES}
+was set in the call to @code{pex_init}, and the system supports pipes;
+2) if @code{PEX_LAST} is set in @var{flags}, and @var{outname} is
+@code{NULL}. Otherwise the code will use a file to hold standard
+output. If @code{PEX_LAST} is not set, this file is considered to be
+a temporary file, and it will be removed when no longer needed, unless
+@code{PEX_SAVE_TEMPS} was set in the call to @code{pex_init}.
+
+There are two cases to consider when setting the name of the file to
+hold standard output.
+
+First case: @code{PEX_SUFFIX} is set in @var{flags}. In this case
+@var{outname} may not be @code{NULL}. If the @var{tempbase} parameter
+to @code{pex_init} was not @code{NULL}, then the output file name is
+the concatenation of @var{tempbase} and @var{outname}. If
+@var{tempbase} was @code{NULL}, then the output file name is a random
+file name ending in @var{outname}.
+
+Second case: @code{PEX_SUFFIX} was not set in @var{flags}. In this
+case, if @var{outname} is not @code{NULL}, it is used as the output
+file name. If @var{outname} is @code{NULL}, and @var{tempbase} was
+not NULL, the output file name is randomly chosen using
+@var{tempbase}. Otherwise the output file name is chosen completely
+at random.
+
+@var{errname} is the file name to use for standard error output. If
+it is @code{NULL}, standard error is the same as the caller.
+Otherwise, standard error is written to the named file.
+
+On an error return, the code sets @code{*@var{err}} to an @code{errno}
+value, or to 0 if there is no relevant @code{errno}.
+
+@end deftypefn
+
@c alloca.c:26
@deftypefn Replacement void* alloca (size_t @var{size})
@end deftypefn
-@c asprintf.c:33
+@c asprintf.c:29
@deftypefn Extension int asprintf (char **@var{resptr}, const char *@var{format}, ...)
Like @code{sprintf}, but instead of passing a pointer to a buffer, you
the buffer needed, allocate memory with @code{malloc}, and store a
pointer to the allocated memory in @code{*@var{resptr}}. The value
returned is the same as @code{sprintf} would return. If memory could
-not be allocated, zero is returned and @code{NULL} is stored in
+not be allocated, minus one is returned and @code{NULL} is stored in
@code{*@var{resptr}}.
@end deftypefn
@end deftypefn
-@c argv.c:139
+@c argv.c:121
@deftypefn Extension char** buildargv (char *@var{sp})
Given a pointer to a string, parse the string extracting fields
@end deftypefn
-@c make-temp-file.c:88
+@c make-temp-file.c:87
@deftypefn Replacement char* choose_tmpdir ()
Returns a pointer to a directory path suitable for creating temporary
@end deftypefn
-@c argv.c:65
+@c argv.c:49
@deftypefn Extension char** dupargv (char **@var{vector})
Duplicate an argument vector. Simply scans through @var{vector},
@end deftypefn
-@c strerror.c:566
+@c strerror.c:567
@deftypefn Extension int errno_max (void)
Returns the maximum @code{errno} value for which a corresponding
@end deftypefn
-@c argv.c:111
+@c argv.c:94
@deftypefn Extension void freeargv (char **@var{vector})
Free an argument vector that was built using @code{buildargv}. Simply
@end deftypefn
-@c getruntime.c:78
+@c getruntime.c:82
@deftypefn Replacement long get_run_time (void)
Returns the time used so far, in microseconds. If possible, this is
@end deftypefn
+@c gettimeofday.c:12
+@deftypefn Supplemental int gettimeofday (struct timeval *@var{tp}, void *@var{tz})
+
+Writes the current time to @var{tp}. This implementation requires
+that @var{tz} be NULL. Returns 0 on success, -1 on failure.
+
+@end deftypefn
+
+@c hex.c:30
+@deftypefn Extension void hex_init (void)
+
+Initializes the array mapping the current character set to
+corresponding hex values. This function must be called before any
+call to @code{hex_p} or @code{hex_value}. If you fail to call it, a
+default ASCII-based table will normally be used on ASCII systems.
+
+@end deftypefn
+
+@c hex.c:39
+@deftypefn Extension int hex_p (int @var{c})
+
+Evaluates to non-zero if the given character is a valid hex character,
+or zero if it is not. Note that the value you pass will be cast to
+@code{unsigned char} within the macro.
+
+@end deftypefn
+
+@c hex.c:47
+@deftypefn Extension {unsigned int} hex_value (int @var{c})
+
+Returns the numeric equivalent of the given character when interpreted
+as a hexidecimal digit. The result is undefined if you pass an
+invalid hex digit. Note that the value you pass will be cast to
+@code{unsigned char} within the macro.
+
+The @code{hex_value} macro returns @code{unsigned int}, rather than
+signed @code{int}, to make it easier to use in parsing addresses from
+hex dump files: a signed @code{int} would be sign-extended when
+converted to a wider unsigned type --- like @code{bfd_vma}, on some
+systems.
+
+@end deftypefn
+
@c index.c:5
@deftypefn Supplemental char* index (char *@var{s}, int @var{c})
@end deftypefn
+@c safe-ctype.c:46
+@deffn Extension ISALPHA (@var{c})
+@deffnx Extension ISALNUM (@var{c})
+@deffnx Extension ISBLANK (@var{c})
+@deffnx Extension ISCNTRL (@var{c})
+@deffnx Extension ISDIGIT (@var{c})
+@deffnx Extension ISGRAPH (@var{c})
+@deffnx Extension ISLOWER (@var{c})
+@deffnx Extension ISPRINT (@var{c})
+@deffnx Extension ISPUNCT (@var{c})
+@deffnx Extension ISSPACE (@var{c})
+@deffnx Extension ISUPPER (@var{c})
+@deffnx Extension ISXDIGIT (@var{c})
+
+These twelve macros are defined by @file{safe-ctype.h}. Each has the
+same meaning as the corresponding macro (with name in lowercase)
+defined by the standard header @file{ctype.h}. For example,
+@code{ISALPHA} returns true for alphabetic characters and false for
+others. However, there are two differences between these macros and
+those provided by @file{ctype.h}:
+
+@itemize @bullet
+@item These macros are guaranteed to have well-defined behavior for all
+values representable by @code{signed char} and @code{unsigned char}, and
+for @code{EOF}.
+
+@item These macros ignore the current locale; they are true for these
+fixed sets of characters:
+@multitable {@code{XDIGIT}} {yada yada yada yada yada yada yada yada}
+@item @code{ALPHA} @tab @kbd{A-Za-z}
+@item @code{ALNUM} @tab @kbd{A-Za-z0-9}
+@item @code{BLANK} @tab @kbd{space tab}
+@item @code{CNTRL} @tab @code{!PRINT}
+@item @code{DIGIT} @tab @kbd{0-9}
+@item @code{GRAPH} @tab @code{ALNUM || PUNCT}
+@item @code{LOWER} @tab @kbd{a-z}
+@item @code{PRINT} @tab @code{GRAPH ||} @kbd{space}
+@item @code{PUNCT} @tab @kbd{`~!@@#$%^&*()_-=+[@{]@}\|;:'",<.>/?}
+@item @code{SPACE} @tab @kbd{space tab \n \r \f \v}
+@item @code{UPPER} @tab @kbd{A-Z}
+@item @code{XDIGIT} @tab @kbd{0-9A-Fa-f}
+@end multitable
+
+Note that, if the host character set is ASCII or a superset thereof,
+all these macros will return false for all values of @code{char} outside
+the range of 7-bit ASCII. In particular, both ISPRINT and ISCNTRL return
+false for characters with numeric values from 128 to 255.
+@end itemize
+@end deffn
+
+@c safe-ctype.c:95
+@deffn Extension ISIDNUM (@var{c})
+@deffnx Extension ISIDST (@var{c})
+@deffnx Extension IS_VSPACE (@var{c})
+@deffnx Extension IS_NVSPACE (@var{c})
+@deffnx Extension IS_SPACE_OR_NUL (@var{c})
+@deffnx Extension IS_ISOBASIC (@var{c})
+These six macros are defined by @file{safe-ctype.h} and provide
+additional character classes which are useful when doing lexical
+analysis of C or similar languages. They are true for the following
+sets of characters:
+
+@multitable {@code{SPACE_OR_NUL}} {yada yada yada yada yada yada yada yada}
+@item @code{IDNUM} @tab @kbd{A-Za-z0-9_}
+@item @code{IDST} @tab @kbd{A-Za-z_}
+@item @code{VSPACE} @tab @kbd{\r \n}
+@item @code{NVSPACE} @tab @kbd{space tab \f \v \0}
+@item @code{SPACE_OR_NUL} @tab @code{VSPACE || NVSPACE}
+@item @code{ISOBASIC} @tab @code{VSPACE || NVSPACE || PRINT}
+@end multitable
+@end deffn
+
@c lbasename.c:23
@deftypefn Replacement {const char*} lbasename (const char *@var{name})
@end deftypefn
-@c make-temp-file.c:138
+@c lrealpath.c:25
+@deftypefn Replacement {const char*} lrealpath (const char *@var{name})
+
+Given a pointer to a string containing a pathname, returns a canonical
+version of the filename. Symlinks will be resolved, and ``.'' and ``..''
+components will be simplified. The returned value will be allocated using
+@code{malloc}, or @code{NULL} will be returned on a memory allocation error.
+
+@end deftypefn
+
+@c make-relative-prefix.c:24
+@deftypefn Extension {const char*} make_relative_prefix (const char *@var{progname}, const char *@var{bin_prefix}, const char *@var{prefix})
+
+Given three paths @var{progname}, @var{bin_prefix}, @var{prefix},
+return the path that is in the same position relative to
+@var{progname}'s directory as @var{prefix} is relative to
+@var{bin_prefix}. That is, a string starting with the directory
+portion of @var{progname}, followed by a relative pathname of the
+difference between @var{bin_prefix} and @var{prefix}.
+
+If @var{progname} does not contain any directory separators,
+@code{make_relative_prefix} will search @env{PATH} to find a program
+named @var{progname}. Also, if @var{progname} is a symbolic link,
+the symbolic link will be resolved.
+
+For example, if @var{bin_prefix} is @code{/alpha/beta/gamma/gcc/delta},
+@var{prefix} is @code{/alpha/beta/gamma/omega/}, and @var{progname} is
+@code{/red/green/blue/gcc}, then this function will return
+@code{/red/green/blue/../../omega/}.
+
+The return value is normally allocated via @code{malloc}. If no
+relative prefix can be found, return @code{NULL}.
+
+@end deftypefn
+
+@c make-temp-file.c:137
@deftypefn Replacement char* make_temp_file (const char *@var{suffix})
Return a temporary file name (as a string) or @code{NULL} if unable to
@end deftypefn
+@c mempcpy.c:23
+@deftypefn Supplemental void* mempcpy (void *@var{out}, const void *@var{in}, size_t @var{length})
+
+Copies @var{length} bytes from memory region @var{in} to region
+@var{out}. Returns a pointer to @var{out} + @var{length}.
+
+@end deftypefn
+
@c memset.c:6
@deftypefn Supplemental void* memset (void *@var{s}, int @var{c}, size_t @var{count})
@end deftypefn
-@c pexecute.c:67
-@deftypefn Extension int pexecute (const char *@var{program}, char * const *@var{argv}, const char *@var{this_pname}, const char *@var{temp_base}, char **@var{errmsg_fmt}, char **@var{errmsg_arg}, int flags)
+@c pexecute.txh:155
+@deftypefn Extension void pex_free (struct pex_obj @var{obj})
-Executes a program.
+Clean up and free all data associated with @var{obj}.
-@var{program} and @var{argv} are the arguments to
-@code{execv}/@code{execvp}.
+@end deftypefn
+
+@c pexecute.txh:131
+@deftypefn Extension int pex_get_status (struct pex_obj *@var{obj}, int @var{count}, int *@var{vector})
+
+Returns the exit status of all programs run using @var{obj}.
+@var{count} is the number of results expected. The results will be
+placed into @var{vector}. The results are in the order of the calls
+to @code{pex_run}. Returns 0 on error, 1 on success.
+
+@end deftypefn
+
+@c pexecute.txh:140
+@deftypefn Extension int pex_get_times (struct pex_obj *@var{obj}, int @var{count}, struct pex_time *@var{vector})
+
+Returns the process execution times of all programs run using
+@var{obj}. @var{count} is the number of results expected. The
+results will be placed into @var{vector}. The results are in the
+order of the calls to @code{pex_run}. Returns 0 on error, 1 on
+success.
-@var{this_pname} is name of the calling program (i.e., @code{argv[0]}).
+@code{struct pex_time} has the following fields: @code{user_seconds},
+@code{user_microseconds}, @code{system_seconds},
+@code{system_microseconds}. On systems which do not support reporting
+process times, all the fields will be set to @code{0}.
-@var{temp_base} is the path name, sans suffix, of a temporary file to
-use if needed. This is currently only needed for MS-DOS ports that
-don't use @code{go32} (do any still exist?). Ports that don't need it
-can pass @code{NULL}.
+@end deftypefn
+
+@c pexecute.txh:119
+@deftypefn Extension FILE * pex_read_output (struct pex_obj *@var{obj}, int @var{binary})
-(@code{@var{flags} & PEXECUTE_SEARCH}) is non-zero if @env{PATH} should be searched
-(??? It's not clear that GCC passes this flag correctly). (@code{@var{flags} &
-PEXECUTE_FIRST}) is nonzero for the first process in chain.
-(@code{@var{flags} & PEXECUTE_FIRST}) is nonzero for the last process
-in chain. The first/last flags could be simplified to only mark the
-last of a chain of processes but that requires the caller to always
-mark the last one (and not give up early if some error occurs).
-It's more robust to require the caller to mark both ends of the chain.
+Returns a @code{FILE} pointer which may be used to read the standard
+output of the last program in the pipeline. When this is used,
+@code{PEX_LAST} should not be used in a call to @code{pex_run}. After
+this is called, @code{pex_run} may no longer be called with the same
+@var{obj}. @var{binary} should be non-zero if the file should be
+opened in binary mode. Don't call @code{fclose} on the returned file;
+it will be closed by @code{pex_free}.
-The result is the pid on systems like Unix where we
-@code{fork}/@code{exec} and on systems like WIN32 and OS/2 where we
-use @code{spawn}. It is up to the caller to wait for the child.
+@end deftypefn
-The result is the @code{WEXITSTATUS} on systems like MS-DOS where we
-@code{spawn} and wait for the child here.
+@c pexecute.txh:173
+@deftypefn Extension int pexecute (const char *@var{program}, char * const *@var{argv}, const char *@var{this_pname}, const char *@var{temp_base}, char **@var{errmsg_fmt}, char **@var{errmsg_arg}, int flags)
-Upon failure, @var{errmsg_fmt} and @var{errmsg_arg} are set to the
-text of the error message with an optional argument (if not needed,
-@var{errmsg_arg} is set to @code{NULL}), and @minus{}1 is returned.
-@code{errno} is available to the caller to use.
+This is the old interface to execute one or more programs. It is
+still supported for compatibility purposes, but is no longer
+documented.
@end deftypefn
-@c strsignal.c:547
+@c strsignal.c:539
@deftypefn Supplemental void psignal (unsigned @var{signo}, char *@var{message})
Print @var{message} to the standard error, followed by a colon,
@end deftypefn
-@c pexecute.c:104
+@c pexecute.txh:181
@deftypefn Extension int pwait (int @var{pid}, int *@var{status}, int @var{flags})
-Waits for a program started by @code{pexecute} to finish.
-
-@var{pid} is the process id of the task to wait for. @var{status} is
-the `status' argument to wait. @var{flags} is currently unused (allows
-future enhancement without breaking upward compatibility). Pass 0 for now.
-
-The result is the pid of the child reaped, or -1 for failure
-(@code{errno} says why).
-
-On systems that don't support waiting for a particular child, @var{pid} is
-ignored. On systems like MS-DOS that don't really multitask @code{pwait}
-is just a mechanism to provide a consistent interface for the caller.
+Another part of the old execution interface.
@end deftypefn
@end deftypefn
-@c concat.c:177
+@c concat.c:167
@deftypefn Extension char* reconcat (char *@var{optr}, const char *@var{s1}, @dots{}, @code{NULL})
Same as @code{concat}, except that if @var{optr} is not @code{NULL} it
@end deftypefn
-@c strsignal.c:353
+@c strsignal.c:348
@deftypefn Extension int signo_max (void)
Returns the maximum signal value for which a corresponding symbolic
@end deftypefn
+@c snprintf.c:28
+@deftypefn Supplemental int snprintf (char *@var{buf}, size_t @var{n}, const char *@var{format}, ...)
+
+This function is similar to sprintf, but it will print at most @var{n}
+characters. On error the return value is -1, otherwise it returns the
+number of characters that would have been printed had @var{n} been
+sufficiently large, regardless of the actual value of @var{n}. Note
+some pre-C99 system libraries do not implement this correctly so users
+cannot generally rely on the return value if the system version of
+this function is used.
+
+@end deftypefn
+
@c spaces.c:22
@deftypefn Extension char* spaces (int @var{count})
@end deftypefn
+@c stpcpy.c:23
+@deftypefn Supplemental char* stpcpy (char *@var{dst}, const char *@var{src})
+
+Copies the string @var{src} into @var{dst}. Returns a pointer to
+@var{dst} + strlen(@var{src}).
+
+@end deftypefn
+
+@c stpncpy.c:23
+@deftypefn Supplemental char* stpncpy (char *@var{dst}, const char *@var{src}, size_t @var{len})
+
+Copies the string @var{src} into @var{dst}, copying exactly @var{len}
+and padding with zeros if necessary. If @var{len} < strlen(@var{src})
+then return @var{dst} + @var{len}, otherwise returns @var{dst} +
+strlen(@var{src}).
+
+@end deftypefn
+
@c strcasecmp.c:15
@deftypefn Supplemental int strcasecmp (const char *@var{s1}, const char *@var{s2})
@end deftypefn
-@c strerror.c:602
+@c strerror.c:603
@deftypefn Supplemental char* strerror (int @var{errnoval})
Maps an @code{errno} number to an error message string, the contents
@end deftypefn
+@c strndup.c:23
+@deftypefn Extension char* strndup (const char *@var{s}, size_t @var{n})
+
+Returns a pointer to a copy of @var{s} with at most @var{n} characters
+in memory obtained from @code{malloc}, or @code{NULL} if insufficient
+memory was available. The result is always NUL terminated.
+
+@end deftypefn
+
@c strrchr.c:6
@deftypefn Supplemental char* strrchr (const char *@var{s}, int @var{c})
@end deftypefn
-@c strsignal.c:388
+@c strsignal.c:383
@deftypefn Supplemental {const char *} strsignal (int @var{signo})
Maps an signal number to an signal message string, the contents of
@end deftypefn
-@c strsignal.c:452
+@c strsignal.c:446
@deftypefn Extension {const char*} strsigno (int @var{signo})
Given an signal number, returns a pointer to a string containing the
@end deftypefn
-@c strerror.c:730
+@c strerror.c:729
@deftypefn Extension int strtoerrno (const char *@var{name})
Given the symbolic name of a error number (e.g., @code{EACCES}), map it
@end deftypefn
-@c strsignal.c:507
+@c strsignal.c:500
@deftypefn Extension int strtosigno (const char *@var{name})
Given the symbolic name of a signal, map it to a signal number. If no
@end deftypefn
-@c vasprintf.c:48
+@c unlink-if-ordinary.c:27
+@deftypefn Supplemental int unlink_if_ordinary (const char*)
+
+Unlinks the named file, unless it is special (e.g. a device file).
+Returns 0 when the file was unlinked, a negative value (and errno set) when
+there was an error deleting the file, and a positive value if no attempt
+was made to unlink the file because it is special.
+
+@end deftypefn
+
+@c vasprintf.c:47
@deftypefn Extension int vasprintf (char **@var{resptr}, const char *@var{format}, va_list @var{args})
Like @code{vsprintf}, but instead of passing a pointer to a buffer,
of the buffer needed, allocate memory with @code{malloc}, and store a
pointer to the allocated memory in @code{*@var{resptr}}. The value
returned is the same as @code{vsprintf} would return. If memory could
-not be allocated, zero is returned and @code{NULL} is stored in
+not be allocated, minus one is returned and @code{NULL} is stored in
@code{*@var{resptr}}.
@end deftypefn
@end deftypefn
+@c vsnprintf.c:28
+@deftypefn Supplemental int vsnprintf (char *@var{buf}, size_t @var{n}, const char *@var{format}, va_list @var{ap})
+
+This function is similar to vsprintf, but it will print at most
+@var{n} characters. On error the return value is -1, otherwise it
+returns the number of characters that would have been printed had
+@var{n} been sufficiently large, regardless of the actual value of
+@var{n}. Note some pre-C99 system libraries do not implement this
+correctly so users cannot generally rely on the return value if the
+system version of this function is used.
+
+@end deftypefn
+
@c waitpid.c:3
@deftypefn Supplemental int waitpid (int @var{pid}, int *@var{status}, int)
@end deftypefn
+@c xstrndup.c:23
+@deftypefn Replacement char* xstrndup (const char *@var{s}, size_t @var{n})
+
+Returns a pointer to a copy of @var{s} with at most @var{n} characters
+without fail, using @code{xmalloc} to obtain memory. The result is
+always NUL terminated.
+
+@end deftypefn
+
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