Next: Function and Syntax Index, Previous: Library modules - Utilities, Up: Top [Contents][Index]
For the convenience of the programmers familiar to C, I composed a simple table of C operators and library functions with the corresponding Scheme functions.
+
R7RS arithmetic procedure +
. See Arithmetics.
+=
Gauche inc!
macro. See Assignments.
-
R7RS arithmetic procedure -
. See Arithmetics.
-=
Gauche dec!
macro. See Assignments.
->
Gauche slot-ref
is something close to this. See Accessing instance.
* (binary)
R7RS arithmetic procedure *
. See Arithmetics.
* (unary)
No equivalent procedure. Scheme doesn’t have explicit notation of pointers.
*=
No equivalent procedure.
/
In C, it has two different meanings depending on the types
of operands. For real division, use /
.
For integer quotient, use quotient
.
See Arithmetics.
/=
No equivalent procedure.
& (binary)
Gauche logand
. See scheme.bitwise
- R7RS bitwise operations.
& (unary)
No equivalent procedure. Scheme doesn’t have explicit notation of pointers.
&&
R7RS syntax and
. See Conditionals.
&=
No equivalent procedure.
|
Gauche logior
. See scheme.bitwise
- R7RS bitwise operations.
||
R7RS syntax or
. See Conditionals.
|=
No equivalent procedure.
^
Gauche logxor
. See scheme.bitwise
- R7RS bitwise operations.
=
R7RS syntax set!
. See Assignments.
==
R7RS equivalence procedure, eq?
, eqv?
and equal?
.
See Equality.
<
<=
R7RS arithmetic procedure <
and <=
.
See Numerical comparison. Unlike C operator, Scheme version
is transitive.
<<
Gauche ash
. See scheme.bitwise
- R7RS bitwise operations.
<<=
No equivalent procedure.
>
>=
R7RS arithmetic procedure >
and >=
.
See Numerical comparison. Unlike C operator, Scheme version
is transitive.
>>
Gauche ash
. See scheme.bitwise
- R7RS bitwise operations.
>>=
No equivalent procedure.
%
R7RS operator modulo
and remainder
. See Arithmetics.
%=
No equivalent procedure.
[]
R7RS vector-ref
(see Vectors) is something close.
Or you can use Gauche’s generic function ref
(see gauche.sequence
- Sequence framework)
for arbitrary sequences.
.
Gauche slot-ref
is something close to this. See Accessing instance.
~
Gauche lognot
. See scheme.bitwise
- R7RS bitwise operations.
~=
No equivalent procedure.
!
R7RS procedure not
. See Booleans.
!=
No equivalent procedure.
abort
Gauche sys-abort
. See Program termination.
abs
R7RS abs
. See Arithmetics.
access
Gauche sys-access
. See File stats.
acos
R7RS acos
. See Arithmetics.
alarm
Gauche sys-alarm
. See Miscellaneous system calls.
asctime
Gauche sys-asctime
. See Time.
asin
R7RS asin
. See Arithmetics.
assert
No equivalent function in Gauche.
atan
atan2
R7RS atan
. See Arithmetics.
atexit
No equivalent function in Gauche, but the "after" thunk of active
dynamic handlers are called when exit
is called.
See Program termination, and See Continuations.
atof
atoi
atol
You can use string->number
. See Numerical conversions.
bsearch
You can use SRFI-133’s vector-binary-search
.
See scheme.vector
- R7RS vectors.
calloc
Allocation is handled automatically in Scheme.
ceil
R7RS ceiling
. See Arithmetics.
cfgetispeed
cfgetospeed
cfsetispeed
cfsetospeed
Gauche’s sys-cfgetispeed
, sys-cfgetospeed
,
sys-cfsetispeed
, sys-cfsetospeed
. See gauche.termios
- Terminal control.
chdir
Gauche’s sys-chdir
. See Other file operations.
chmod
Gauche’s sys-chmod
. See File stats.
chown
Gauche’s sys-chown
. See File stats.
clearerr
Not supported yet.
clock
No equivalent function in Gauche. You can use sys-times
to get information about CPU time.
close
You can’t directly close the file descriptor, but when you use
close-input-port
or close-output-port
, underlying
file is closed. Some port-related functions, such as
call-with-output-file
, automatically closes the file
when operation is finished. The file is also closed when
its governing port is garbage collected.
See Common port operations.
closedir
No equivalent function in Gauche. You can use
sys-readdir
to read the directory entries at once.
See Directories.
cos
cosh
cos
and cosh
. See Arithmetics.
creat
A file is implicitly created by default when you open it for writing. See File ports for more control over the creation of files.
ctermid
Gauche sys-ctermid
. See System inquiry.
ctime
Gauche sys-ctime
. See Time.
cuserid
No equivalent function. This is removed from the newer POSIX.
You can use alternative functions, such as sys-getlogin
or
sys-getpwuid
with sys-getuid
.
difftime
Gauche sys-difftime
. See Time.
div
You can use R7RS quotient
and remainder
.
See Arithmetics.
dup
dup2
Not directly supported, but you can use port-fd-dup!
.
execl
execle
execlp
execv
execve
execvp
Gauche sys-exec
. See Process management.
For higher level interface, gauche.process
- High-level process interface.
exit
_exit
Use exit
or sys-exit
, depends on what you need.
See Program termination.
exp
R7RS exp
. See Arithmetics.
fabs
R7RS abs
. See Arithmetics.
fclose
You can’t directly close the file stream, but when you use
close-input-port
or close-output-port
, underlying
file is closed. Some port-related functions, such as
call-with-output-file
, automatically closes the file
when operation is finished. The file is also closed when
its governing port is garbage collected.
fcntl
Implemented as sys-fcntl
in gauche.fcntl
module.
See gauche.fcntl
- Low-level file operations.
fdopen
Gauche’s open-input-fd-port
or open-output-fd-port
.
See File ports.
feof
No equivalent operation, but you can check if an input port
have reached to the end by peek-char
or peek-byte
.
See Reading data.
ferror
Not supported yet.
fflush
Gauche’s flush
. See Output.
fgetc
Use read-char
or read-byte
. See Input.
fgetpos
Use Gauche’s port-tell
(see Common port operations)
fgets
Use read-line
or read-string
. See Input.
fileno
port-file-number
. See Common port operations.
floor
R7RS floor
. See Arithmetics.
fmod
Gauche’s fmod
.
fopen
R7RS open-input-file
or open-output-file
corresponds to this operation. See File ports.
fork
Gauche’s sys-fork
. See Process management.
forkpty
Use sys-forkpty
. See gauche.termios
- Terminal control.
fpathconf
Not supported.
fprintf
Not directly supported, but Gauche’s format
provides similar functionality. See Output.
SLIB has printf
implementation.
fputc
Use write-char
or write-byte
. See Output.
fputs
Use display
. See Output.
fread
Not directly supported.
To read binary numbers, see binary.io
- Binary I/O.
If you want to read a chunk of bytes, you may be
able to use read-uvector!
.
See Uvector block I/O.
free
You don’t need this in Scheme.
freopen
Not supported.
frexp
Gauche’s frexp
fscanf
Not supported. For general case, you have to write a parser.
If you can keep the data in S-exp, you can use read
.
If the syntax is very simple, you may be able to utilize
string-tokenize
in srfi.14
(srfi.13
- String library),
and/or regular expression stuff (Regular expressions).
fseek
Use Gauche’s port-seek
(see Common port operations)
fsetpos
Use Gauche’s port-seek
(see Common port operations)
fstat
Gauche’s sys-stat
. See File stats.
ftell
Use Gauche’s port-tell
(see Common port operations)
fwrite
Not directly supported.
To write binary numbers, see binary.io
- Binary I/O.
If you want to write a chunk of bytes,
you can simply use display
or write-uvector
(see Uvector block I/O).
getc
getchar
Use read-char
or read-byte
. See Input.
getcwd
Gauche’s sys-getcwd
. See System inquiry.
getdomainname
Gauche’s sys-getdomainname
. See System inquiry.
getegid
Gauche’s sys-getegid
. See System inquiry.
getenv
Gauche’s sys-getenv
. See Environment inquiry.
geteuid
Gauche’s sys-geteuid
. See System inquiry.
gethostname
Gauche’s sys-gethostname
. See System inquiry.
getgid
Gauche’s sys-getgid
. See System inquiry.
getgrgid
getgrnam
Gauche’s sys-getgrgid
and sys-getgrnam
. See Unix groups and users.
getgroups
Gauche’s sys-getgroups
. See System inquiry.
getlogin
Gauche’s sys-getlogin
. See System inquiry.
getpgrp
Gauche’s sys-getpgrp
. See System inquiry.
getpid
getppid
Gauche’s sys-getpid
. See System inquiry.
getpwnam
getpwuid
Gauche’s sys-getpwnam
and sys-getpwuid
. See Unix groups and users.
gets
Use read-line
or read-string
. See Input.
gettimeofday
Gauche’s sys-gettimeofday
. See Time.
getuid
Gauche’s sys-getuid
. See System inquiry.
gmtime
Gauche’s sys-gmtime
. See Time.
isalnum
Not directly supported, but you can use R7RS char-alphabetic?
and
char-numeric?
. See Characters. You can also use
character set. See Character Sets, also scheme.charset
- R7RS character sets.
isalpha
R7RS char-alphabetic?
. See Characters. See also
Character Sets and scheme.charset
- R7RS character sets.
isatty
Gauche’s sys-isatty
. See Other file operations.
iscntrl
Not directly supported, but you can use
(char-set-contains? char-set:iso-control c)
with srfi.14
.
See scheme.charset
- R7RS character sets.
isdigit
R7RS char-numeric?
. See Characters.
You can also use (char-set-contains? char-set:digit c)
with srfi.14
. See scheme.charset
- R7RS character sets.
isgraph
Not directly supported, but you can use
(char-set-contains? char-set:graphic c)
with srfi.14
.
See scheme.charset
- R7RS character sets.
islower
R7RS char-lower-case?
. See Characters.
You can also use (char-set-contains? char-set:lower-case c)
with srfi.14
. See scheme.charset
- R7RS character sets.
isprint
Not directly supported, but you can use
(char-set-contains? char-set:printing c)
with srfi.14
.
See scheme.charset
- R7RS character sets.
ispunct
Not directly supported, but you can use
(char-set-contains? char-set:punctuation c)
with srfi.14
.
See scheme.charset
- R7RS character sets.
isspace
R7RS char-whitespace?
. See Characters.
You can also use (char-set-contains? char-set:whitespace c)
with srfi.14
. See scheme.charset
- R7RS character sets.
isupper
R7RS char-upper-case?
. See Characters.
You can also use (char-set-contains? char-set:upper-case c)
with srfi.14
. See scheme.charset
- R7RS character sets.
isxdigit
Not directly supported, but you can use
(char-set-contains? char-set:hex-digit c)
with srfi.14
.
See scheme.charset
- R7RS character sets.
kill
Gauche’s sys-kill
. See Signal.
labs
R7RS abs
. See Arithmetics.
ldexp
Gauche’s ldexp
.
ldiv
Use R7RS quotient
and remainder
.
See Arithmetics.
link
Gauche’s sys-link
. See Directory manipulation.
localeconv
Gauche’s sys-localeconv
. See Locale.
localtime
Gauche’s sys-localtime
. See Time.
log
R7RS log
. See Arithmetics.
log10
Not directly supported. log10(z)
≡ (/ (log z) (log 10))
.
longjmp
R7RS call/cc
provides similar (superior) mechanism.
See Continuations.
lseek
Use Gauche’s port-seek
(see Common port operations)
malloc
Not necessary in Scheme.
mblen
mbstowcs
mbtowc
Gauche handles multibyte strings internally, so generally you don’t
need to care about multibyte-ness of the string. string-length
always returns a number of characters for a string in supported
encoding. If you want to convert the character encoding,
see gauche.charconv
- Character Code Conversion.
memcmp
memcpy
memmove
memset
No equivalent functions.
mkdir
Gauche’s sys-mkdir
. See Directory manipulation.
mkfifo
Gauche’s sys-mkfifo
.
mkstemp
Gauche’s sys-mkstemp
. See Directory manipulation.
Use this instead of tmpnam.
mktime
Gauche’s sys-mktime
. See Time.
modf
Gauche’s modf
.
open
Not directly supported.
R7RS open-input-file
or open-output-file
corresponds to this operation. See File ports.
opendir
Not directly supported.
You can use sys-readdir
to read the directory entries at once.
See Directories.
openpty
Use sys-openpty
. See gauche.termios
- Terminal control.
pathconf
Not supported.
pause
Gauche’s sys-pause
. See Miscellaneous system calls.
perror
No equivalent function in Gauche. System calls generally throws an
error (<system-error>
), including the description of the reason
of failure.
pipe
Gauche’s sys-pipe
. See Other file operations.
pow
R7RS expt
. See Arithmetics.
printf
Not directly supported, but Gauche’s format
provides similar functionality. See Output.
SLIB has printf
implementation.
putc
putchar
Use write-char
or write-byte
. See Output.
puts
Use display
. See Output.
qsort
Gauche’s sort
and sort!
provides a convenient way to sort
list of items. See Sorting and merging.
raise
No equivalent function in Gauche. Scheme function raise
(SRFI-18)
is to raise an exception. You can use (sys-kill (sys-getpid) SIG)
to send a signal SIG
to the current process.
rand
Not supported directly, but on most platforms a better RNG is available
as sys-random
. See Miscellaneous system calls.
read
Not supported directly, but you may be able to use
read-uvector
or
read-uvector!
(see Uvector block I/O).
readdir
Not supported directly. Gauche’s sys-readdir
reads
the directory at once. See Directories.
readlink
Gauche’s sys-readlink
. See Directory manipulation.
This function is available on systems that support symbolic links.
realloc
Not necessary in Scheme.
realpath
Gauche’s sys-normalize-pathname
or sys-realpath
.
See Pathnames.
remove
Gauche’s sys-remove
. See Directory manipulation.
rename
Gauche’s sys-rename
. See Directory manipulation.
rewind
Not directly supported, but you can use port-seek
instead.
See Common port operations.
rewinddir
Not supported directly.
You can use sys-readdir
to read the directory entries at once.
See Directories.
rmdir
Gauche’s sys-rmdir
. See Directory manipulation.
scanf
Not supported. For general case, you have to write a parser.
If you can keep the data in S-exp, you can use read
.
If the syntax is very simple, you may be able to utilize
string-tokenize
in srfi.14
(srfi.13
- String library),
and/or regular expression stuff (Regular expressions).
select
Gauche’s sys-select
. See I/O multiplexing.
setbuf
Not necessary.
setgid
Gauche’s sys-setgid
.
setjmp
R7RS call/cc
provides similar (superior) mechanism.
See Continuations.
setlocale
Gauche’s sys-setlocale
. See Locale.
setpgid
Gauche’s sys-setpgid
. See System inquiry.
setsid
Gauche’s sys-setsid
. See System inquiry.
setuid
Gauche’s sys-setuid
. See System inquiry.
setvbuf
Not necessary.
sigaction
You can use set-signal-handler!
to install signal handlers.
See Handling signals.
sigaddset
sigdelset
sigemptyset
sigfillset
Gauche’s sys-sigset-add!
and sys-sigset-delete!
.
See Signals and signal sets.
sigismember
Not supported yet.
siglongjmp
R7RS call/cc
provides similar (superior) mechanism.
See Continuations.
signal
You can use with-signal-handlers
to install signal handlers.
See Handling signals.
sigpending
Not supported yet.
sigprocmask
Signal mask is handled internally. See Handling signals.
sigsetjmp
R7RS call/cc
provides similar (superior) mechanism.
See Continuations.
sigsuspend
Gauche’s sys-sigsuspend
. See Masking and waiting signals.
sigwait
Gauche’s sys-sigwait
. See Masking and waiting signals.
sin
sinh
Use sin
and sinh
. See Arithmetics.
sleep
Gauche’s sys-sleep
. See Miscellaneous system calls.
sprintf
Not directly supported, but Gauche’s format
provides similar functionality. See Output.
SLIB has printf
implementation.
sqrt
R7RS sqrt
. See Arithmetics.
srand
Not supported directly, but on most platforms a better RNG is available
as sys-srandom
(see Miscellaneous system calls).
The math.mt-random
module provides much superior RNG
(see math.mt-random
- Mersenne Twister Random number generator).
sscanf
Not supported. For general case, you have to write a parser.
If you can keep the data in S-exp, you can use read
.
If the syntax is very simple, you may be able to utilize
string-tokenize
in srfi.14
(srfi.13
- String library),
and/or regular expression stuff (Regular expressions).
stat
Gauche’s sys-stat
. See File stats.
strcasecmp
R7RS string-ci=?
and other comparison functions.
See String comparison.
strcat
R7RS string-append
. See String utilities.
strchr
SRFI-13 string-index
. See String searching.
strcmp
R7RS string=?
and other comparison functions.
See String comparison.
strcoll
Not supported yet.
strcpy
R7RS string-copy
. See String utilities.
strcspn
Not directly supported, but you can use SRFI-13 string-skip
with a character set. See String searching.
strerror
Gauche’s sys-strerror
. See System inquiry.
strftime
Gauche’s sys-strftime
. See Time.
strlen
R7RS string-length
. See String accessors & modifiers.
strncat
Not directly supported, but you can use string-append
and
substring
.
strncasecmp
SRFI-13 string-compare-ci
provides the most flexible
(but a bit difficult to use) functionality.
See String comparison.
If what you want is just to check the fixed-length prefixes of two
string matches, you can use SRFI-13 string-prefix-ci?
.
strncmp
SRFI-13 string-compare
provides the most flexible
(but a bit difficult to use) functionality.
See String comparison.
If what you want is just to check the fixed-length prefixes of two
string matches, you can use SRFI-13 string-prefix?
.
See String prefixes & suffixes.
strncpy
SRFI-13 substring
. See String utilities.
strpbrk
Not directly supported, but you can use SRFI-13 string-skip
with a character set. See String searching.
strrchr
SRFI-13 string-index-right
. See String searching.
strspn
Not directly supported, but you can use SRFI-13 string-index
with a character set. See String searching.
strstr
SRFI-13 string-contains
. See String searching.
strtod
You can use R7RS string->number
. See Numerical conversions.
strtok
SRFI-13 string-tokenize
. See Other string operations.
strtol
strtoul
You can use R7RS string->number
. See Numerical conversions.
strxfrm
Not supported yet.
symlink
Gauche’s sys-symlink
. See Directory manipulation.
This function is available on systems that support symbolic links.
sysconf
Not supported yet.
system
Gauche’s sys-system
. See Process management.
It is generally recommended to use the process library
(gauche.process
- High-level process interface).
tan
tanh
R7RS tan
and Gauche tanh
. See Arithmetics.
tcdrain
tcflow
tcflush
tcgetattr
tcgetpgrp
tcsendbreak
tcsetattr
tcsetpgrp
Corresponding functions are: sys-tcdrain
, sys-tcflow
,
sys-tcflush
, sys-tcgetattr
, sys-tcgetpgrp
,
sys-tcsendbreak
, sys-tcsetattr
, sys-tcsetpgrp
.
See gauche.termios
- Terminal control.
time
Gauche’s sys-time
. See Time.
times
Gauche’s sys-times
. See System inquiry.
tmpfile
Not exactly supported. See sys-mkstemp
instead.
See Directory manipulation.
tmpnam
Gauche’s sys-tmpnam
.
This function is provided since it is in POSIX, but its use is
discouraged for the potential security risk. Use sys-mkstemp
instead. See Directory manipulation.
tolower
toupper
R7RS char-upcase
and char-downcase
. See Characters.
ttyname
Gauche’s sys-ttyname
. See Other file operations.
tzset
Not supported yet.
umask
Gauche’s sys-umask
. See Directory manipulation.
uname
Gauche’s sys-uname
. See System inquiry.
ungetc
Not directly supported. You can use peek-char
to look
one character ahead, instead of pushing back.
unlink
Gauche’s sys-unlink
. See Directory manipulation.
utime
Gauche’s sys-utime
. See File stats.
va_arg
va_end
va_start
Not necessary, for Scheme handles variable number of arguments naturally.
vfprintf
vprintf
vsprintf
Not directly supported, but Gauche’s format
provides similar functionality. See Output.
SLIB has printf
implementation.
wait
Gauche’s sys-wait
. See Process management.
waitpid
Gauche’s sys-waitpid
. See Process management.
wcstombs
wctomb
Gauche handles multibyte strings internally, so generally you don’t
need to care about multibyte-ness of the string. string-length
always returns a number of characters for a string in supported
encoding. If you want to convert the character encoding,
see gauche.charconv
- Character Code Conversion.
write
R7RS display
(see Output).
Or write-uvector
(see Uvector block I/O).
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