57 lines
1.7 KiB
Modula-2
57 lines
1.7 KiB
Modula-2
DEFINITION MODULE Strings;
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(*
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Module: String manipulations
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Author: Ceriel J.H. Jacobs
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Version: $Id$
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*)
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(* Note: truncation of strings may occur if the user does not provide
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large enough variables to contain the result of the operation.
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*)
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(* Strings are of type ARRAY OF CHAR, and their length is the size
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of the array, unless a 0-byte occurs in the string to indicate the
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end of the string.
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*)
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PROCEDURE Assign(source: ARRAY OF CHAR; VAR dest: ARRAY OF CHAR);
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(* Assign string source to dest
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*)
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PROCEDURE Insert(substr: ARRAY OF CHAR; VAR str: ARRAY OF CHAR; inx: CARDINAL);
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(* Insert the string substr into str, starting at str[inx].
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If inx is equal to or greater than Length(str) then substr is appended
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to the end of str.
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*)
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PROCEDURE Delete(VAR str: ARRAY OF CHAR; inx, len: CARDINAL);
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(* Delete len characters from str, starting at str[inx].
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If inx >= Length(str) then nothing happens.
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If there are not len characters to delete, characters to the end of the
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string are deleted.
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*)
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PROCEDURE Pos(substr, str: ARRAY OF CHAR): CARDINAL;
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(* Return the index into str of the first occurrence of substr.
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Pos returns a value greater than HIGH(str) of no occurrence is found.
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*)
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PROCEDURE Copy(str: ARRAY OF CHAR;
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inx, len: CARDINAL;
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VAR result: ARRAY OF CHAR);
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(* Copy at most len characters from str into result, starting at str[inx].
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*)
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PROCEDURE Concat(s1, s2: ARRAY OF CHAR; VAR result: ARRAY OF CHAR);
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(* Concatenate two strings.
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*)
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PROCEDURE Length(str: ARRAY OF CHAR): CARDINAL;
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(* Return number of characters in str.
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*)
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PROCEDURE CompareStr(s1, s2: ARRAY OF CHAR): INTEGER;
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(* Compare two strings, return -1 if s1 < s2, 0 if s1 = s2, and 1 if s1 > s2.
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*)
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END Strings.
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