CHRPAK
Strings and Characters

CHRPAK is a C++ library which handles characters and strings.

CHRPAK began when I simply wanted to be able to capitalize a string. Now it has expanded to a number of interesting uses. Many unusual situations are provided for, including

• string '31.2' <=> numeric value 31.2;
• uppercase <=> lowercase;
• removal of control characters or blanks;
• sorting, merging, searching.

Many of the routine names begin with the name of the data type they operate on:

• B4 - a 4 byte word;
• CH - a character;
• CHVEC - a vector of characters;
• DEC - a decimal fraction;
• DIGIT - a character representing a numeric digit;
• I4 - an integer;
• R4 - a real;
• R8 - a double precision real;
• RAT - a ratio I/J;
• S - a string;
• SVEC - a vector of strings;
• SVECI - a vector of strings, implicitly capitalized;

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Related Data and Programs:

CAESAR, a C++ library which can apply a Caesar Shift Cipher to a string of text.

ROT13, a C++ library which can encipher a string using the ROT13 cipher for letters, and the ROT5 cipher for digits.

Languages:

CHRPAK is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.

Source Code:

• chrpak.cpp, the source code;
• chrpak.hpp, the include file;

Examples and Tests:

• chrpak_test.cpp, the calling program;
• chrpak_test.txt, the output file.

List of Routines:

• A_TO_I4 returns the index of an alphabetic character.
• BASE_TO_I4 returns the value of an integer represented in some base.
• BYTE_TO_INT converts 4 bytes into an unsigned integer.
• CH_CAP capitalizes a single character.
• CH_COUNT_CVEC_ADD adds a character vector to a character count.
• CH_COUNT_FILE_ADD adds characters in a file to a character count.
• CH_COUNT_INIT initializes a character count.
• CH_COUNT_PRINT prints a set of character counts.
• CH_COUNT_S_ADD adds a character string to a character histogram.
• CH_EQI is true if two characters are equal, disregarding case.
• CH_INDEX_FIRST finds the first occurrence of a character in a string.
• CH_INDEX_LAST finds the last occurrence of a character in a string.
• CH_IS_ALPHA is TRUE if a charaacter is alphabetic.
• CH_IS_ALPHANUMERIC is TRUE if a character is alphanumeric.
• CH_IS_CONTROL is TRUE if a character is a control character.
• CH_IS_DIGIT returns TRUE if a character is a decimal digit.
• CH_IS_FORMAT_CODE returns TRUE if a character is a FORTRAN format code.
• CH_IS_LOWER is TRUE if C is a lowercase alphabetic character.
• CH_IS_PRINTABLE determines if a character is printable.
• CH_IS_SPACE is TRUE if a character represents "white space".
• CH_IS_UPPER is TRUE if C is an uppercase alphabetic character.
• CH_LOW lowercases a single character.
• CH_PAD "pads" a character in a string with a blank on either side.
• CH_READ reads one character from a binary file.
• CH_SCRABBLE returns the character on a given Scrabble tile.
• CH_SCRABBLE_FREQUENCY returns the Scrabble frequency of a character.
• CH_SCRABBLE_POINTS returns the Scrabble point value of a character.
• CH_SCRABBLE_SELECT selects a character with the Scrabble probability.
• CH_SWAP swaps two characters.
• CH_TO_DIGIT returns the integer value of a base 10 digit.
• CH_TO_DIGIT_BIN returns the integer value of a binary digit.
• CH_TO_DIGIT_OCT returns the integer value of an octal digit.
• CH_TO_ROT13 converts a character to its ROT13 equivalent.
• CH_TO_SCRABBLE returns the Scrabble index of a character.
• CH_UNIFORM returns a random character in a given range.
• CH_WRITE writes one character to a binary file.
• CHARSTAR_ADJUSTL flushes a CHAR* string left.
• CHARSTAR_CAT concatenates two CHAR*'s to make a third.
• CHARSTAR_EQI reports whether two CHAR*'s are equal, ignoring case.
• CHARSTAR_LEN_TRIM returns the length of a CHAR* to the last nonblank.
• DIGIT_BIN_TO_CH returns the character representation of a binary digit.
• DIGIT_INC increments a decimal digit.
• DIGIT_OCT_TO_CH returns the character representation of an octal digit.
• DIGIT_TO_CH returns the base 10 digit character corresponding to a digit.
• GETBITS returns N bits from an unsigned int X, beginning at position P.
• HEX_DIGIT_TO_I4 converts a hexadecimal digit to an I4.
• HEX_TO_BINARY_DIGITS converts a hexadecimal digit to 4 binary digits.
• HEX_TO_I4 converts a hexadecimal string to its integer value.
• I4_HUGE returns a "huge" I4, usually the largest legal signed int.
• I4_INPUT prints a prompt string and reads an I4 from the user.
• I4_LOG_10 returns the whole part of the logarithm base 10 of an I4.
• I4_MAX returns the maximum of two I4's.
• I4_MIN returns the smaller of two I4's.
• I4_SWAP switches two I4's.
• I4_TO_A returns the I-th alphabetic character.
• I4_TO_AMINO_CODE converts an integer to an amino code.
• I4_TO_HEX_DIGIT converts a (small) I4 to a hexadecimal digit.
• I4_TO_ISBN converts an I4 to an ISBN digit.
• I4_TO_MONTH_ABB returns an abbreviated month name.
• I4_TO_MONTH_NAME returns a month name.
• I4_TO_S converts an I4 to a string.
• I4_TO_S0 converts an I4 to a string with leading zeros.
• I4_TO_STRING converts an I4 to a C++ string.
• I4_TO_UNARY produces the "base 1" representation of an I4.
• I4_UNIFORM_AB returns a scaled pseudorandom I4 between A and B.
• I4VEC_INDICATOR sets an I4VEC to the indicator vector.
• I4VEC_PRINT prints an I4VEC.
• INT_TO_BYTE converts an unsigned integer into 4 bytes.
• ISBN_TO_I4 converts an ISBN character into an I4.
• PERM_CHECK checks that a vector represents a permutation.
• PERM_UNIFORM selects a random permutation of N objects.
• PRINT_SIZES reports the size in bytes of various data types.
• R4_ABS returns the absolute value of an R4.
• R4_NINT returns the nearest integer to an R4.
• R4_TO_STRING converts an R4 to a C++ string.
• R8_TO_STRING converts an R8 to a C++ string.
• R8_UNIFORM_01 returns a unit pseudorandom R8.
• REVERSE_BYTES_FLOAT reverses the four bytes in a float.
• REVERSE_BYTES_INT reverses the four bytes in an int.
• S_ADJUSTL flushes a string left.
• S_BEGIN reports whether string 1 begins with string 2, ignoring case.
• S_BEHEAD_SUBSTRING "beheads" a string, removing a given substring.
• S_BLANK_DELETE removes blanks and left justifies the remainder.
• S_BLANKS_DELETE replaces consecutive blanks by one blank.
• S_CAP capitalizes all the characters in a string.
• S_CH_COUNT counts occurrences of a particular character in a string.
• S_CH_DELETE removes all occurrences of a character from a string.
• S_CONTROL_BLANK replaces control characters with blanks.
• S_DIGITS_COUNT counts the digits in a string.
• S_EQI reports whether two strings are equal, ignoring case.
• S_ESCAPE_TEX de-escapes TeX escape sequences.
• S_FIRST_CH points to the first occurrence of a character in a string.
• S_FIRST_NONBLANK points to the first nonblank character in a string.
• S_INC_C "increments" the characters in a string.
• S_INC_N increments the digits in a string.
• S_LAST_CH points to the last occurrence of a character in a string.
• S_LEN_TRIM returns the length of a string to the last nonblank.
• S_LOW lowercases a string.
• S_NEWLINE_TO_NULL replaces carriage returns or newlines by nulls.
• S_NONALPHA_DELETE removes nonalphabetic characters from a string.
• S_REPLACE_CH replaces all occurrences of one character by another.
• S_REVERSE reverses the characters in a string.
• S_S_SUBANAGRAM determines if S2 is a "subanagram" of S1.
• S_S_SUBANAGRAM_SORTED determines if S2 is a "subanagram" of S1.
• S_SCRABBLE_POINTS returns the Scrabble point value of a string.
• S_SORT_A sorts a string into ascending order.
• S_SUBSTRING returns a substring of a given string.
• S_TAB_BLANK replaces each TAB character by a space.
• S_TO_DIGITS extracts N digits from a string.
• S_TO_FORMAT reads a FORTRAN format from a string.
• S_TO_I4 reads an I4 from a string.
• S_TO_I4VEC reads an I4VEC from a string.
• S_TO_L reads an L from a string.
• S_TO_R4 reads an R4 from a string.
• S_TO_R4VEC reads an R4VEC from a string.
• S_TO_R8 reads an R8 from a string.
• S_TO_R8VEC reads an R8VEC from a string.
• S_TO_ROT13 "rotates" the alphabetical characters in a string by 13 positions.
• S_TRIM promotes the final null forward through trailing blanks.
• S_WORD_CAP capitalizes the first character of each word in a string.
• S_WORD_COUNT counts the number of "words" in a string.
• S_WORD_EXTRACT_FIRST extracts the first word from a string.
• SORT_HEAP_EXTERNAL externally sorts a list of items into ascending order.
• SWAP_BYTES_FLOAT swaps pairs of bytes in a float.
• SWAP_BYTES_INT swaps pairs of bytes in an int.
• TIMESTAMP prints the current YMDHMS date as a time stamp.
• WORD_NEXT_READ "reads" words from a string, one at a time.

You can go up one level to the C++ source codes.