3 * - By John Hodge (thePowersGang)
6 * - Kernel-land C Library
9 #include <hal_proc.h> // For MM_*
12 #define RANDOM_SEED 0xACE55052
13 #define RANDOM_A 0x00731ADE
14 #define RANDOM_C 12345
15 #define RANDOM_SPRUCE 0xf12b039
19 int atoi(const char *string);
20 int ParseInt(const char *string, int *Val);
21 void itoa(char *buf, Uint64 num, int base, int minLength, char pad);
22 int vsnprintf(char *__s, size_t __maxlen, const char *__format, va_list args);
23 int snprintf(char *__s, size_t __n, const char *__format, ...);
24 int sprintf(char *__s, const char *__format, ...);
25 int strucmp(const char *Str1, const char *Str2);
26 char *strchr(const char *__s, int __c);
27 int strpos(const char *Str, char Ch);
28 size_t strlen(const char *__s);
29 char *strcpy(char *__str1, const char *__str2);
30 char *strncpy(char *__str1, const char *__str2, size_t max);
31 char *strcat(char *dest, const char *source);
32 int strcmp(const char *str1, const char *str2);
33 int strncmp(const char *str1, const char *str2, size_t num);
34 char *_strdup(const char *File, int Line, const char *Str);
36 void *memmove(void *__dest, const void *__src, size_t len);
38 int CheckString(char *String);
39 int CheckMem(void *Mem, int NumBytes);
62 EXPORT(_strdup); // Takes File/Line too
71 * \brief Convert a string into an integer
73 int atoi(const char *string)
76 ParseInt(string, &ret);
79 int ParseInt(const char *string, int *Val)
83 const char *orig_string = string;
85 //Log("atoi: (string='%s')", string);
87 // Clear non-numeric characters
88 while( !('0' <= *string && *string <= '9') && *string != '-' ) string++;
89 if( *string == '-' ) {
91 while( !('0' <= *string && *string <= '9') ) string++;
103 if('0' <= *string && *string <= '9') {
105 ret += *string - '0';
107 else if('A' <= *string && *string <= 'F') {
109 ret += *string - 'A' + 10;
111 else if('a' <= *string && *string <= 'f') {
113 ret += *string - 'a' + 10;
121 for( ; '0' <= *string && *string <= '7'; string ++ )
124 ret += *string - '0';
130 for( ; '0' <= *string && *string <= '9'; string++)
133 ret += *string - '0';
136 if( ret == 0 ) return 0;
141 //Log("atoi: RETURN %i", ret);
145 return string - orig_string;
148 static const char cUCDIGITS[] = "0123456789ABCDEF";
150 * \fn void itoa(char *buf, Uint64 num, int base, int minLength, char pad)
151 * \brief Convert an integer into a character string
153 void itoa(char *buf, Uint64 num, int base, int minLength, char pad)
163 if(base > 16 || base < 2) {
169 while(num > base-1) {
170 num = DivMod64U(num, base, &rem); // Shift `num` and get remainder
171 tmpBuf[pos] = cUCDIGITS[ rem ];
174 tmpBuf[pos++] = cUCDIGITS[ num ]; // Last digit of `num`
179 while(minLength-- > 0) buf[i++] = pad;
180 while(pos-- > 0) buf[i++] = tmpBuf[pos]; // Reverse the order of characters
185 * \brief Append a character the the vsnprintf output
187 #define PUTCH(ch) do { \
188 if(pos < __maxlen) { \
189 if(__s) __s[pos] = ch; \
195 #define GETVAL() do {\
196 if(isLongLong) val = va_arg(args, Uint64);\
197 else val = va_arg(args, unsigned int);\
200 * \brief VArg String Number Print Formatted
202 int vsnprintf(char *__s, size_t __maxlen, const char *__format, va_list args)
205 int minSize = 0, precision = -1, len;
206 char tmpBuf[34]; // For Integers
207 const char *p = NULL;
214 while((c = *__format++) != 0)
216 // Non control character
217 if(c != '%') { PUTCH(c); continue; }
223 if(c == '%') { PUTCH('%'); continue; }
225 // Pointer - Done first for debugging
227 Uint ptr = va_arg(args, Uint);
228 PUTCH('*'); PUTCH('0'); PUTCH('x');
229 for( len = BITS/4; len --; )
230 PUTCH( cUCDIGITS[ (ptr>>(len*4))&15 ] );
234 // - Padding Side Flag
249 if(c == '*') { // Dynamic length
250 minSize = va_arg(args, unsigned int);
253 else if('1' <= c && c <= '9')
256 while('0' <= c && c <= '9')
271 if(c == '*') { // Dynamic length
272 precision = va_arg(args, unsigned int);
275 else if('1' <= c && c <= '9')
278 while('0' <= c && c <= '9')
281 precision += c - '0';
287 // - Default, Long or LongLong?
289 if(c == 'l') // Long is actually the default on x86
298 // - Now get the format code
305 if( isLongLong && val >> 63 ) {
309 else if( !isLongLong && val >> 31 ) {
313 itoa(tmpBuf, val, 10, minSize, pad);
315 case 'u': // Unsigned
317 itoa(tmpBuf, val, 10, minSize, pad);
319 case 'P': // Physical Address
322 if(sizeof(tPAddr) > 4) isLongLong = 1;
324 itoa(tmpBuf, val, 16, minSize, pad);
328 isLongLong = 1; // TODO: Handle non-x86 64-bit archs
330 itoa(tmpBuf, val, 16, minSize, pad);
333 case 'x': // Lower case hex
335 itoa(tmpBuf, val, 16, minSize, pad);
339 itoa(tmpBuf, val, 8, minSize, pad);
343 itoa(tmpBuf, val, 2, minSize, pad);
347 val = va_arg(args, unsigned int);
352 // String - Null Terminated Array
354 p = va_arg(args, char*); // Get Argument
355 if( !p || !CheckString(p) ) p = "(inval)"; // Avoid #PFs
359 if( !bPadLeft ) while(len++ < minSize) PUTCH(pad);
360 while(*p && precision--) PUTCH(*p++);
361 if( bPadLeft ) while(len++ < minSize) PUTCH(pad);
364 case 'C': // Non-Null Terminated Character Array
365 p = va_arg(args, char*);
366 if( !CheckMem(p, minSize) ) continue; // No #PFs please
367 if(!p) goto printString;
368 while(minSize--) PUTCH(*p++);
380 if(__s && pos != __maxlen)
389 int snprintf(char *__s, size_t __n, const char *__format, ...)
394 va_start(args, __format);
395 ret = vsnprintf(__s, __n, __format, args);
403 int sprintf(char *__s, const char *__format, ...)
408 va_start(args, __format);
409 ret = vsnprintf(__s, -1, __format, args);
422 return isalpha(c) || isdigit(c);
426 return isupper(c) || islower(c);
430 return (0 <= c && c < 128);
434 if(c == '\t') return 1;
435 if(c == ' ') return 1;
440 // TODO: Check iscntrl
441 if(c < ' ') return 1;
446 return ('0' <= c && c <= '9');
450 // TODO: Check isgraph
455 return ('a' <= c && c <= 'z');
459 if( ' ' <= c && c <= 0x7F ) return 1;
475 if(c == ' ') return 1;
476 if(c == '\t') return 1;
477 if(c == '\v') return 1;
478 if(c == '\n') return 1;
479 if(c == '\r') return 1;
484 return ('a' <= c && c <= 'z');
488 return isdigit(c) || ('a' <= c && c <= 'f') || ('A' <= c && c <= 'F');
507 * \fn int strucmp(const char *Str1, const char *Str2)
508 * \brief Compare \a Str1 and \a Str2 case-insensitively
510 int strucmp(const char *Str1, const char *Str2)
512 while(*Str1 && tolower(*Str1) == tolower(*Str2))
514 return tolower(*Str1) - tolower(*Str2);
518 * \brief Locate a byte in a string
520 char *strchr(const char *__s, int __c)
522 for( ; *__s; __s ++ )
524 if( *__s == __c ) return (char*)__s;
529 char *strrchr(const char *__s, int __c)
531 size_t ofs = strlen(__s);
532 while(--ofs && __s[ofs] != __c);
533 if( __s[ofs] == __c )
534 return (char*)__s + ofs;
539 * \fn int strpos(const char *Str, char Ch)
540 * \brief Search a string for an ascii character
542 int strpos(const char *Str, char Ch)
545 for(pos=0;Str[pos];pos++)
547 if(Str[pos] == Ch) return pos;
553 * \fn size_t strlen(const char *__str)
554 * \brief Get the length of string
556 size_t strlen(const char *__str)
559 while(*__str++) ret++;
564 * \brief Copy a string to a new location
566 char *strcpy(char *__str1, const char *__str2)
569 *__str1++ = *__str2++;
570 *__str1 = '\0'; // Terminate String
575 * \brief Copy a string to a new location
576 * \note Copies at most `max` chars
578 char *strncpy(char *__str1, const char *__str2, size_t __max)
580 while(*__str2 && __max-- >= 1)
581 *__str1++ = *__str2++;
583 *__str1 = '\0'; // Terminate String
588 * \brief Append a string to another
590 char *strcat(char *__dest, const char *__src)
595 *__dest++ = *__src++;
601 * \brief Append at most \a n chars to a string from another
602 * \note At most n+1 chars are written (the dest is always zero terminated)
604 char *strncat(char *__dest, const char *__src, size_t n)
607 while(*__src && n-- >= 1)
608 *__dest++ = *__src++;
614 * \fn int strcmp(const char *str1, const char *str2)
615 * \brief Compare two strings return the difference between
616 * the first non-matching characters.
618 int strcmp(const char *str1, const char *str2)
620 while(*str1 && *str1 == *str2)
622 return *str1 - *str2;
626 * \fn int strncmp(const char *Str1, const char *Str2, size_t num)
627 * \brief Compare strings \a Str1 and \a Str2 to a maximum of \a num characters
629 int strncmp(const char *Str1, const char *Str2, size_t num)
631 if(num == 0) return 0; // TODO: Check what should officially happen here
632 while(--num && *Str1 && *Str1 == *Str2)
639 * \fn char *strdup(const char *Str)
640 * \brief Duplicates a string
642 char *strdup(const char *Str)
645 ret = malloc(strlen(Str)+1);
646 if( !ret ) return NULL;
653 * \fn char *_strdup(const char *File, int Line, const char *Str)
654 * \brief Duplicates a string
656 char *_strdup(const char *File, int Line, const char *Str)
659 ret = Heap_Allocate(File, Line, strlen(Str)+1);
660 if( !ret ) return NULL;
668 * \brief Pseudo random number generator
673 static Uint state = RANDOM_SEED;
675 // Get the next state value
676 giRandomState = (RANDOM_A*state + RANDOM_C);
677 // Check if it has changed, and if it hasn't, change it
678 if(state == old) state += RANDOM_SPRUCE;
681 // http://en.wikipedia.org/wiki/Xorshift
683 static Uint32 x = 123456789;
684 static Uint32 y = 362436069;
685 static Uint32 z = 521288629;
686 static Uint32 w = 88675123;
691 return w = w ^ (w >> 19) ^ t ^ (t >> 8);
695 void *memmove(void *__dest, const void *__src, size_t len)
698 const char *src = __src;
701 if( len == 0 || dest == src )
704 if( (tVAddr)dest > (tVAddr)src + len )
705 return memcpy(dest, src, len);
706 if( (tVAddr)dest + len < (tVAddr)src )
707 return memcpy(dest, src, len);
709 // NOTE: Assumes memcpy works forward
710 if( (tVAddr)dest < (tVAddr)src )
711 return memcpy(dest, src, len);
715 if( (tVAddr)dest < (tVAddr)src )
716 block_size = (tVAddr)src - (tVAddr)dest;
718 block_size = (tVAddr)dest - (tVAddr)src;
722 while(len >= block_size)
724 memcpy(dest, src, block_size);
729 memcpy(dest, src, len);
732 for( int i = len; i--; )
741 // NOTE: Strictly not libc, but lib.c is used by userland code too
743 * \name Memory Validation
747 * \brief Checks if a string resides fully in valid memory
749 int CheckString(const char *String)
754 addr = (tVAddr)String;
756 if( !MM_GetPhysAddr( (void*)addr ) )
760 bUser = MM_IsUser( addr );
762 while( *(char*)addr )
764 if( (addr & (PAGE_SIZE-1)) == 0 )
766 if(bUser && !MM_IsUser(addr) )
768 if(!bUser && !MM_GetPhysAddr((void*)addr) )
777 * \brief Check if a sized memory region is valid memory
778 * \return Boolean success
780 int CheckMem(const void *Mem, int NumBytes)
782 return MM_IsValidBuffer( (tVAddr)Mem, NumBytes );