2 * AcessOS Basic C Library
11 * \fn EXPORT int strcmp(const char *s1, const char *s2)
12 * \brief Compare two strings
14 EXPORT int strcmp(const char *s1, const char *s2)
16 while(*s1 == *s2 && *s1 != '\0' && *s2 != '\0') {
19 return (int)*s1 - (int)*s2;
23 * \fn EXPORT int strncmp(const char *s1, const char *s2)
24 * \brief Compare two strings
26 EXPORT int strncmp(const char *s1, const char *s2, size_t n)
28 if( n == 0 ) return 0;
29 while(n -- && *s1 == *s2 && *s1 != '\0' && *s2 != '\0') {
32 return (int)*s1 - (int)*s2;
36 * \fn EXPORT char *strcpy(char *dst, const char *src)
37 * \brief Copy a string to another
39 EXPORT char *strcpy(char *dst, const char *src)
51 * \fn EXPORT char *strncpy(char *dst, const char *src)
52 * \brief Copy at most \a num characters from \a src to \a dst
55 EXPORT char *strncpy(char *dst, const char *src, size_t num)
58 while(*src && num--) *to++ = *src++;
64 * \fn EXPORT char *strcat(char *dst, const char *src)
65 * \brief Append a string onto another
67 EXPORT char *strcat(char *dst, const char *src)
73 while(*src) *to++ = *src++;
80 * \fn EXPORT int strlen(const char *str)
81 * \brief Get the length of a string
83 EXPORT int strlen(const char *str)
86 for(retval = 0; *str != '\0'; str++)
92 * \fn EXPORT char *strdup(const char *str)
93 * \brief Duplicate a string using heap memory
94 * \note Defined in POSIX Spec, not C spec
96 EXPORT char *strdup(const char *str)
98 size_t len = strlen(str);
99 char *ret = malloc(len+1);
100 if(ret == NULL) return NULL;
106 * \fn EXPORT char *strndup(const char *str, size_t maxlen)
107 * \brief Duplicate a string into the heap with a maximum length
108 * \param str Input string buffer
109 * \param maxlen Maximum valid size of the \a str buffer
110 * \return Heap string with the same value of \a str
112 EXPORT char *strndup(const char *str, size_t maxlen)
116 for( len = 0; len < maxlen && str[len]; len ++) ;
117 ret = malloc( len + 1);
118 memcpy( ret, str, len );
124 * \fn EXPORT char *strchr(char *str, int character)
125 * \brief Locate a character in a string
127 EXPORT char *strchr(char *str, int character)
131 if(*str == character) return str;
137 * \fn EXPORT char *strrchr(char *str, int character)
138 * \brief Locate the last occurance of a character in a string
140 EXPORT char *strrchr(char *str, int character)
146 if(str[i] == character) return &str[i];
152 * \fn EXPORT char *strstr(char *str1, const char *str2)
153 * \brief Search a \a str1 for the first occurance of \a str2
155 EXPORT char *strstr(char *str1, const char *str2)
157 const char *test = str2;
161 if(*test == '\0') return str1;
162 if(*str1 == *test) test++;
171 * \fn EXPORT void *memset(void *dest, int val, size_t num)
172 * \brief Clear memory with the specified value
174 EXPORT void *memset(void *dest, int val, size_t num)
176 unsigned char *p = dest;
177 while(num--) *p++ = val;
182 * \fn EXPORT void *memcpy(void *dest, const void *src, size_t count)
183 * \brief Copy one memory area to another
185 EXPORT void *memcpy(void *dest, const void *src, size_t count)
187 char *sp = (char *)src;
188 char *dp = (char *)dest;
189 for(;count--;) *dp++ = *sp++;
194 * \fn EXPORT void *memmove(void *dest, const void *src, size_t count)
195 * \brief Copy data in memory, avoiding overlap problems
197 EXPORT void *memmove(void *dest, const void *src, size_t count)
199 char *sp = (char *)src;
200 char *dp = (char *)dest;
201 // Check if corruption will happen
202 if( (unsigned int)dest > (unsigned int)src && (unsigned int)dest < (unsigned int)src+count )
203 for(;count--;) dp[count] = sp[count];
205 for(;count--;) *dp++ = *sp++;
210 * \fn EXPORT int memcmp(const void *mem1, const void *mem2, size_t count)
211 * \brief Compare two regions of memory
212 * \param mem1 Region 1
213 * \param mem2 Region 2
214 * \param count Number of bytes to check
216 EXPORT int memcmp(const void *mem1, const void *mem2, size_t count)
220 if( *(unsigned char*)mem1 != *(unsigned char*)mem2 )
221 return *(unsigned char*)mem1 - *(unsigned char*)mem2;
229 * \fn EXPORT void *memchr(void *ptr, int value, size_t num)
230 * \brief Locates the first occurence of \a value starting at \a ptr
231 * \param ptr Starting memory location
232 * \param value Value to find
233 * \param num Size of memory area to check
235 EXPORT void *memchr(void *ptr, int value, size_t num)
239 if( *(unsigned char*)ptr == (unsigned char)value )