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122 lines
5.2 KiB
Plaintext
122 lines
5.2 KiB
Plaintext
Character Checking and Conversion Functions for C02
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This library provides functions for classifying ASCII characters, as
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well as converting upper-case characters to lower-case characters
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and vice-versa.
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The character classification functions return a value of -1 ($FF)
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for TRUE, and 0 for FALSE. All these functions return FALSE when
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passed a high ASCII character (127 - 255).
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#include <ctype.h02>
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The following functions are defined:
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b = isalnm(c); Returns TRUE if c is alphanumeric, otherwise FALSE.
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An alphanumeric character is a letter (A-Z or a-z),
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or a digit (0-9).
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Note: Calls internal routine isaln, which in turn
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calls internal routines isdgt and isalp.
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b = isalph(c); Returns TRUE if c is alphabetic, otherwise FALSE.
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An alphabetic character is a letter (A-Z or a-z).
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Note: Call internal routine isalp, which in turn
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calls internal routines isupr and islwr.
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b = isbdgt(c); Returns TRUE if c is a binary digit, otherwise FALSE.
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A binary digit is a character in the range 0 through 1.
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Note: Calls internal routine isbin, which shares code
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with the internal routine isdgt.
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b = isctrl(c); Returns TRUE if c is a control characte, otherwise FALSE.
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A control character is a character with ASCII code
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0 through 31 or 127.
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Note: Calls internal routine isctl.
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b = isdigt(c); Returns TRUE if c is a digit, otherwise FALSE.
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A digit is a character in the range 0 through 9.
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Note: Calls internal routine isdgt.
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b = isgrph(c); Returns TRUE if c is graphical, otherwise FALSE.
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A graphical character is any character in the
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range ! through |.
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Note: Calls internal routine isgrp, which in turn
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calls internal routine isprt.
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b = ishdgt(c); Returns TRUE if c is a hex digit, otherwise FALSE.
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A hex digit is a character in the range 0 through 9.
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A through F, or a through f.
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Note: Calls internal routine ishex, which in turn
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calls internal routine isdgt.
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b = islowr(c); Returns TRUE if c is lowercase, otherwise FALSE.
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An alphabetic character is a letter in the range
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a through z.
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Note: Call internal routine islwr.
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b = ispnct(c); Returns TRUE if c is punctuation, otherwise FALSE.
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A punctuation character is any graphical character
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that is not aplhapnumeric.
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Note: Calls internal routine ispnc, which in turn
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calls internal routines isalp and isgrp.
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b = isprnt(c); Returns TRUE if c is printable, otherwise FALSE.
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A printable character is any character in the
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range Space through |.
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Note: Calls internal routine isprt.
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b = isspce(c); Returns TRUE if c is white space, otherwise FALSE.
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The white space characters are Tab (9), Line Feed (10),
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Vertical Tab (11), Form Feed (12), Carriage Return (13),
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and Space (32).
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Note: Calls internal routine isspc.
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b = isuppr(c); Returns TRUE if c is upper case, otherwise FALSE.
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An uppercase character is a letter in the range
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A through Z.
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Note: Call internal routine isupr.
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t = tolowr(c); Returns lower case version of c if it is an upper case
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character, otherwise c.
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Note: Calls internal routine isupr.
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t = touppr(c); Returns upper case version of c if it is a lower case
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character, otherwise c.
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Note: Calls internal routine islwr.
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Note: This library has no external dependencies.
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Implementation: The standard method of implementing the ctype library is to
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use a bit mask table of 128 bytes (one for each standard ASCII character).
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This library instead uses a series of comparisons in the internal routines,
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which leave the accumulator unmodified, and occupies approximately 128 bytes
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of memory.
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