WebSVN – HelenOS – Diff – /trunk/boot/generic/string.c



 * @brief   String manipulation functions.
 */
 
/** Return number of characters in a string.
 *
 * @param str       NULL terminated string.
 *
 * @return      Number of characters in str.
 */
size_t strlen(const char *str)
{
    int i;
   

        ;
   
    return i;
}
 
/** Compare two NULL terminated strings.
 *
 * Do a char-by-char comparison of two NULL terminated strings.
 * The strings are considered equal iff they consist of the same
 * characters on the minimum of their lengths.
 *
 * @param src       First string to compare.
 * @param dst       Second string to compare.
 *
 * @return      0 if the strings are equal, -1 if first is smaller,
 *          1 if second smaller.
 *
 */
int strcmp(const char *src, const char *dst)
{
    for (; *src && *dst; src++, dst++) {

        return -1;
    return 1;
}
 
 
/** Compare two NULL terminated strings.
 *
 * Do a char-by-char comparison of two NULL terminated strings.
 * The strings are considered equal iff they consist of the same
 * characters on the minimum of their lengths and specified maximal
 * length.
 *
 * @param src       First string to compare.
 * @param dst       Second string to compare.
 * @param len       Maximal length for comparison.
 *
 * @return      0 if the strings are equal, -1 if first is smaller,
 *          1 if second smaller.
 *
 */
int strncmp(const char *src, const char *dst, size_t len)
{
    int i;

 *
 * Copy at most 'len' characters from string 'src' to 'dest'.
 * If 'src' is shorter than 'len', '\0' is inserted behind the
 * last copied character.
 *
 * @param src       Source string.
 * @param dest      Destination buffer.
 * @param len       Size of destination buffer.
 */
void strncpy(char *dest, const char *src, size_t len)
{
    int i;
    for (i = 0; i < len; i++) {

            return;
    }
    dest[i-1] = '\0';
}
 
/** Convert ascii representation to unative_t.
 *
 * Supports 0x for hexa & 0 for octal notation.
 * Does not check for overflows, does not support negative numbers
 *
 * @param text      Textual representation of number.
 * @return      Converted number or 0 if no valid number found.
 */
unative_t atoi(const char *text)
{
    int base = 10;
    unative_t result = 0;

        text += 2;
    } else if (text[0] == '0')
        base = 8;
 
    while (*text) {
        if (base != 16 &&
            ((*text >= 'A' && *text <= 'F') ||
            (*text >='a' && *text <='f')))
            break;
        if (base == 8 && *text >='8')
            break;
 
        if (*text >= '0' && *text <= '9') {

    }
 
    return result;
}
 
/** Move piece of memory to another, possibly overlapping, location.
 *
 * @param dst       Destination address.
 * @param src       Source address.
 * @param len       Number of bytes to move.
 *
 * @return      Destination address.
 */
void *memmove(void *dst, const void *src, size_t len)
{
    char *d = dst;
    const char *s = src;
    if (s < d) {
        while (len--)
            *(d + len) = *(s + len);
    } else {
        while (len--)
            *d++ = *s++;
    }
   
    return dst;
}
 
/** @}
 */

Rev 2071	Rev 3405
Line 37...	Line 37...
37	* @brief String manipulation functions.	37	* @brief String manipulation functions.
38	*/	38	*/
39		39
40	/** Return number of characters in a string.	40	/** Return number of characters in a string.
41	*	41	*
42	* @param str NULL terminated string.	42	* @param str NULL terminated string.
43	*	43	*
44	* @return Number of characters in str.	44	* @return Number of characters in str.
45	*/	45	*/
46	size_t strlen(const char *str)	46	size_t strlen(const char *str)
47	{	47	{
48	int i;	48	int i;
49		49
Line 51...	Line 51...
51	;	51	;
52		52
53	return i;	53	return i;
54	}	54	}
55		55
56	/** Compare two NULL terminated strings	56	/** Compare two NULL terminated strings.
57	*	57	*
58	* Do a char-by-char comparison of two NULL terminated strings.	58	* Do a char-by-char comparison of two NULL terminated strings.
59	* The strings are considered equal iff they consist of the same	59	* The strings are considered equal iff they consist of the same
60	* characters on the minimum of their lengths.	60	* characters on the minimum of their lengths.
61	*	61	*
62	* @param src First string to compare.	62	* @param src First string to compare.
63	* @param dst Second string to compare.	63	* @param dst Second string to compare.
64	*	64	*
65	* @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.	65	* @return 0 if the strings are equal, -1 if first is smaller,
-		66	* 1 if second smaller.
66	*	67	*
67	*/	68	*/
68	int strcmp(const char src, const char dst)	69	int strcmp(const char src, const char dst)
69	{	70	{
70	for (; src && dst; src++, dst++) {	71	for (; src && dst; src++, dst++) {
Line 79...	Line 80...
79	return -1;	80	return -1;
80	return 1;	81	return 1;
81	}	82	}
82		83
83		84
84	/** Compare two NULL terminated strings	85	/** Compare two NULL terminated strings.
85	*	86	*
86	* Do a char-by-char comparison of two NULL terminated strings.	87	* Do a char-by-char comparison of two NULL terminated strings.
87	* The strings are considered equal iff they consist of the same	88	* The strings are considered equal iff they consist of the same
88	* characters on the minimum of their lengths and specified maximal	89	* characters on the minimum of their lengths and specified maximal
89	* length.	90	* length.
90	*	91	*
91	* @param src First string to compare.	92	* @param src First string to compare.
92	* @param dst Second string to compare.	93	* @param dst Second string to compare.
93	* @param len Maximal length for comparison.	94	* @param len Maximal length for comparison.
94	*	95	*
95	* @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.	96	* @return 0 if the strings are equal, -1 if first is smaller,
-		97	* 1 if second smaller.
96	*	98	*
97	*/	99	*/
98	int strncmp(const char src, const char dst, size_t len)	100	int strncmp(const char src, const char dst, size_t len)
99	{	101	{
100	int i;	102	int i;
Line 116...	Line 118...
116	*	118	*
117	* Copy at most 'len' characters from string 'src' to 'dest'.	119	* Copy at most 'len' characters from string 'src' to 'dest'.
118	* If 'src' is shorter than 'len', '\0' is inserted behind the	120	* If 'src' is shorter than 'len', '\0' is inserted behind the
119	* last copied character.	121	* last copied character.
120	*	122	*
121	* @param src Source string.	123	* @param src Source string.
122	* @param dest Destination buffer.	124	* @param dest Destination buffer.
123	* @param len Size of destination buffer.	125	* @param len Size of destination buffer.
124	*/	126	*/
125	void strncpy(char dest, const char src, size_t len)	127	void strncpy(char dest, const char src, size_t len)
126	{	128	{
127	int i;	129	int i;
128	for (i = 0; i < len; i++) {	130	for (i = 0; i < len; i++) {
Line 130...	Line 132...
130	return;	132	return;
131	}	133	}
132	dest[i-1] = '\0';	134	dest[i-1] = '\0';
133	}	135	}
134		136
135	/** Convert ascii representation to unative_t	137	/** Convert ascii representation to unative_t.
136	*	138	*
137	* Supports 0x for hexa & 0 for octal notation.	139	* Supports 0x for hexa & 0 for octal notation.
138	* Does not check for overflows, does not support negative numbers	140	* Does not check for overflows, does not support negative numbers
139	*	141	*
140	* @param text Textual representation of number	142	* @param text Textual representation of number.
141	* @return Converted number or 0 if no valid number ofund	143	* @return Converted number or 0 if no valid number found.
142	*/	144	*/
143	unative_t atoi(const char *text)	145	unative_t atoi(const char *text)
144	{	146	{
145	int base = 10;	147	int base = 10;
146	unative_t result = 0;	148	unative_t result = 0;
Line 150...	Line 152...
150	text += 2;	152	text += 2;
151	} else if (text[0] == '0')	153	} else if (text[0] == '0')
152	base = 8;	154	base = 8;
153		155
154	while (*text) {	156	while (*text) {
155	if (base != 16 && \	157	if (base != 16 &&
156	((text >= 'A' && text <= 'F' )	158	((text >= 'A' && text <= 'F') \|\|
157	\|\| (text >='a' && text <='f')))	159	(text >='a' && text <='f')))
158	break;	160	break;
159	if (base == 8 && *text >='8')	161	if (base == 8 && *text >='8')
160	break;	162	break;
161		163
162	if (text >= '0' && text <= '9') {	164	if (text >= '0' && text <= '9') {
Line 174...	Line 176...
174	}	176	}
175		177
176	return result;	178	return result;
177	}	179	}
178		180
-		181	/** Move piece of memory to another, possibly overlapping, location.
-		182	*
-		183	* @param dst Destination address.
-		184	* @param src Source address.
-		185	* @param len Number of bytes to move.
-		186	*
-		187	* @return Destination address.
-		188	*/
-		189	void memmove(void dst, const void *src, size_t len)
-		190	{
-		191	char *d = dst;
-		192	const char *s = src;
-		193	if (s < d) {
-		194	while (len--)
-		195	(d + len) = (s + len);
-		196	} else {
-		197	while (len--)
-		198	d++ = s++;
-		199	}
-		200
-		201	return dst;
-		202	}
-		203
179	/** @}	204	/** @}
180	*/	205	*/

Subversion Repositories HelenOS

(root)/trunk/boot/generic/string.c @ 2122 – Rev 2071 → 3405