Runtime-Support
Functions
-
Header
Files
• Memory management functions
that
allow
you
to
allocate and deallocate
packets
of
memory. The amount
of
memory that these functions can use
is
defined
by
the constant
MEMORY-SIZE
in the runtime-support
module
memory.
c.
(This module
is
archived in the file
rts.
src.)
By default,
the amount
of
memory available
for
allocation
is
1000
bytes. You can
change this amount
by
modifying
MEMORY-SIZE
and recompiling
me-
mory.c.
• String conversion
functions
that convert strings
to
numeric represent-
ations.
• Searching and sorting functions that
allow
you
to
search and sort arrays.
• Sequence-generation functions that
allow
you to generate a pseudo-
random sequence and
allow
you
to
choose a starting
point
for
a se-
quence.
• Program-exit functions
that
allow
your
program
to
terminate normally
or abnormally.
•
Integer-arithmetic
that
is
not
provided
as
a standard part
of
the C lan-
guage.
6.1.9
String
Functions
(string.h)
The
str
ing.
h header declares standard functions that
allow
you
to
perform
the
following
tasks
with
character arrays (strings):
•
Move
or
copy
entire strings or portions
of
strings,
• Concatenate strings,
• Compare strings,
• Search strings
for
characters or other strings,
and
• Find the length
of
a string.
In
C,
all character strings are terminated
with
a 0
(null)
character. The string
functions named
strxxx
all operate according
to
this convention.
Additional
functions
which
are also declared in
string.
h
allow
you
to
perform corre-
sponding operations on arbitrary sequences
of
bytes (data objects), where a
o value does
not
terminate the object. These functions have names such
as
memxxx.
When you use functions that move or
copy
strings, be sure
that
the destination
is
large enough
to
contain the result.
6-7
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