cpython/Objects/bytes_methods.c

#include "Python.h"
#include "bytes_methods.h"

PyDoc_STRVAR_shared(_Py_isspace__doc__,
"B.isspace() -> bool\n\
\n\
Return True if all characters in B are whitespace\n\
and there is at least one character in B, False otherwise.");

PyObject*
_Py_bytes_isspace(const char *cptr, Py_ssize_t len)
{
    register const unsigned char *p
        = (unsigned char *) cptr;
    register const unsigned char *e;

    /* Shortcut for single character strings */
    if (len == 1 && Py_ISSPACE(*p))
        Py_RETURN_TRUE;

    /* Special case for empty strings */
    if (len == 0)
        Py_RETURN_FALSE;

    e = p + len;
    for (; p < e; p++) {
        if (!Py_ISSPACE(*p))
            Py_RETURN_FALSE;
    }
    Py_RETURN_TRUE;
}


PyDoc_STRVAR_shared(_Py_isalpha__doc__,
"B.isalpha() -> bool\n\
\n\
Return True if all characters in B are alphabetic\n\
and there is at least one character in B, False otherwise.");

PyObject*
_Py_bytes_isalpha(const char *cptr, Py_ssize_t len)
{
    register const unsigned char *p
        = (unsigned char *) cptr;
    register const unsigned char *e;

    /* Shortcut for single character strings */
    if (len == 1 && Py_ISALPHA(*p))
        Py_RETURN_TRUE;

    /* Special case for empty strings */
    if (len == 0)
        Py_RETURN_FALSE;

    e = p + len;
    for (; p < e; p++) {
        if (!Py_ISALPHA(*p))
            Py_RETURN_FALSE;
    }
    Py_RETURN_TRUE;
}


PyDoc_STRVAR_shared(_Py_isalnum__doc__,
"B.isalnum() -> bool\n\
\n\
Return True if all characters in B are alphanumeric\n\
and there is at least one character in B, False otherwise.");

PyObject*
_Py_bytes_isalnum(const char *cptr, Py_ssize_t len)
{
    register const unsigned char *p
        = (unsigned char *) cptr;
    register const unsigned char *e;

    /* Shortcut for single character strings */
    if (len == 1 && Py_ISALNUM(*p))
        Py_RETURN_TRUE;

    /* Special case for empty strings */
    if (len == 0)
        Py_RETURN_FALSE;

    e = p + len;
    for (; p < e; p++) {
        if (!Py_ISALNUM(*p))
            Py_RETURN_FALSE;
    }
    Py_RETURN_TRUE;
}


PyDoc_STRVAR_shared(_Py_isdigit__doc__,
"B.isdigit() -> bool\n\
\n\
Return True if all characters in B are digits\n\
and there is at least one character in B, False otherwise.");

PyObject*
_Py_bytes_isdigit(const char *cptr, Py_ssize_t len)
{
    register const unsigned char *p
        = (unsigned char *) cptr;
    register const unsigned char *e;

    /* Shortcut for single character strings */
    if (len == 1 && Py_ISDIGIT(*p))
        Py_RETURN_TRUE;

    /* Special case for empty strings */
    if (len == 0)
        Py_RETURN_FALSE;

    e = p + len;
    for (; p < e; p++) {
        if (!Py_ISDIGIT(*p))
            Py_RETURN_FALSE;
    }
    Py_RETURN_TRUE;
}


PyDoc_STRVAR_shared(_Py_islower__doc__,
"B.islower() -> bool\n\
\n\
Return True if all cased characters in B are lowercase and there is\n\
at least one cased character in B, False otherwise.");

PyObject*
_Py_bytes_islower(const char *cptr, Py_ssize_t len)
{
    register const unsigned char *p
        = (unsigned char *) cptr;
    register const unsigned char *e;
    int cased;

    /* Shortcut for single character strings */
    if (len == 1)
        return PyBool_FromLong(Py_ISLOWER(*p));

    /* Special case for empty strings */
    if (len == 0)
        Py_RETURN_FALSE;

    e = p + len;
    cased = 0;
    for (; p < e; p++) {
        if (Py_ISUPPER(*p))
            Py_RETURN_FALSE;
        else if (!cased && Py_ISLOWER(*p))
            cased = 1;
    }
    return PyBool_FromLong(cased);
}


PyDoc_STRVAR_shared(_Py_isupper__doc__,
"B.isupper() -> bool\n\
\n\
Return True if all cased characters in B are uppercase and there is\n\
at least one cased character in B, False otherwise.");

PyObject*
_Py_bytes_isupper(const char *cptr, Py_ssize_t len)
{
    register const unsigned char *p
        = (unsigned char *) cptr;
    register const unsigned char *e;
    int cased;

    /* Shortcut for single character strings */
    if (len == 1)
        return PyBool_FromLong(Py_ISUPPER(*p));

    /* Special case for empty strings */
    if (len == 0)
        Py_RETURN_FALSE;

    e = p + len;
    cased = 0;
    for (; p < e; p++) {
        if (Py_ISLOWER(*p))
            Py_RETURN_FALSE;
        else if (!cased && Py_ISUPPER(*p))
            cased = 1;
    }
    return PyBool_FromLong(cased);
}


PyDoc_STRVAR_shared(_Py_istitle__doc__,
"B.istitle() -> bool\n\
\n\
Return True if B is a titlecased string and there is at least one\n\
character in B, i.e. uppercase characters may only follow uncased\n\
characters and lowercase characters only cased ones. Return False\n\
otherwise.");

PyObject*
_Py_bytes_istitle(const char *cptr, Py_ssize_t len)
{
    register const unsigned char *p
        = (unsigned char *) cptr;
    register const unsigned char *e;
    int cased, previous_is_cased;

    /* Shortcut for single character strings */
    if (len == 1)
        return PyBool_FromLong(Py_ISUPPER(*p));

    /* Special case for empty strings */
    if (len == 0)
        Py_RETURN_FALSE;

    e = p + len;
    cased = 0;
    previous_is_cased = 0;
    for (; p < e; p++) {
        register const unsigned char ch = *p;

        if (Py_ISUPPER(ch)) {
            if (previous_is_cased)
                Py_RETURN_FALSE;
            previous_is_cased = 1;
            cased = 1;
        }
        else if (Py_ISLOWER(ch)) {
            if (!previous_is_cased)
                Py_RETURN_FALSE;
            previous_is_cased = 1;
            cased = 1;
        }
        else
            previous_is_cased = 0;
    }
    return PyBool_FromLong(cased);
}


PyDoc_STRVAR_shared(_Py_lower__doc__,
"B.lower() -> copy of B\n\
\n\
Return a copy of B with all ASCII characters converted to lowercase.");

void
_Py_bytes_lower(char *result, const char *cptr, Py_ssize_t len)
{
        Py_ssize_t i;

        /*
        newobj = PyString_FromStringAndSize(NULL, len);
        if (!newobj)
                return NULL;

        s = PyString_AS_STRING(newobj);
        */

        Py_MEMCPY(result, cptr, len);

        for (i = 0; i < len; i++) {
                int c = Py_CHARMASK(result[i]);
                if (Py_ISUPPER(c))
                        result[i] = Py_TOLOWER(c);
        }
}


PyDoc_STRVAR_shared(_Py_upper__doc__,
"B.upper() -> copy of B\n\
\n\
Return a copy of B with all ASCII characters converted to uppercase.");

void
_Py_bytes_upper(char *result, const char *cptr, Py_ssize_t len)
{
        Py_ssize_t i;

        /*
        newobj = PyString_FromStringAndSize(NULL, len);
        if (!newobj)
                return NULL;

        s = PyString_AS_STRING(newobj);
        */

        Py_MEMCPY(result, cptr, len);

        for (i = 0; i < len; i++) {
                int c = Py_CHARMASK(result[i]);
                if (Py_ISLOWER(c))
                        result[i] = Py_TOUPPER(c);
        }
}


PyDoc_STRVAR_shared(_Py_title__doc__,
"B.title() -> copy of B\n\
\n\
Return a titlecased version of B, i.e. ASCII words start with uppercase\n\
characters, all remaining cased characters have lowercase.");

void
_Py_bytes_title(char *result, char *s, Py_ssize_t len)
{
        Py_ssize_t i;
        int previous_is_cased = 0;

        /*
        newobj = PyString_FromStringAndSize(NULL, len);
        if (newobj == NULL)
                return NULL;
        s_new = PyString_AsString(newobj);
        */
        for (i = 0; i < len; i++) {
                int c = Py_CHARMASK(*s++);
                if (Py_ISLOWER(c)) {
                        if (!previous_is_cased)
                            c = Py_TOUPPER(c);
                        previous_is_cased = 1;
                } else if (Py_ISUPPER(c)) {
                        if (previous_is_cased)
                            c = Py_TOLOWER(c);
                        previous_is_cased = 1;
                } else
                        previous_is_cased = 0;
                *result++ = c;
        }
}


PyDoc_STRVAR_shared(_Py_capitalize__doc__,
"B.capitalize() -> copy of B\n\
\n\
Return a copy of B with only its first character capitalized (ASCII).");

void
_Py_bytes_capitalize(char *result, char *s, Py_ssize_t len)
{
        Py_ssize_t i;

        /*
        newobj = PyString_FromStringAndSize(NULL, len);
        if (newobj == NULL)
                return NULL;
        s_new = PyString_AsString(newobj);
        */
        if (0 < len) {
                int c = Py_CHARMASK(*s++);
                if (Py_ISLOWER(c))
                        *result = Py_TOUPPER(c);
                else
                        *result = c;
                result++;
        }
        for (i = 1; i < len; i++) {
                int c = Py_CHARMASK(*s++);
                if (Py_ISUPPER(c))
                        *result = Py_TOLOWER(c);
                else
                        *result = c;
                result++;
        }
}


PyDoc_STRVAR_shared(_Py_swapcase__doc__,
"B.swapcase() -> copy of B\n\
\n\
Return a copy of B with uppercase ASCII characters converted\n\
to lowercase ASCII and vice versa.");

void
_Py_bytes_swapcase(char *result, char *s, Py_ssize_t len)
{
        Py_ssize_t i;

        /*
        newobj = PyString_FromStringAndSize(NULL, len);
        if (newobj == NULL)
                return NULL;
        s_new = PyString_AsString(newobj);
        */
        for (i = 0; i < len; i++) {
                int c = Py_CHARMASK(*s++);
                if (Py_ISLOWER(c)) {
                        *result = Py_TOUPPER(c);
                }
                else if (Py_ISUPPER(c)) {
                        *result = Py_TOLOWER(c);
                }
                else
                        *result = c;
                result++;
        }
}