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);
61 EXPORT(_strdup); // Takes File/Line too
70 * \brief Convert a string into an integer
72 int atoi(const char *string)
75 ParseInt(string, &ret);
78 int ParseInt(const char *string, int *Val)
82 const char *orig_string = string;
84 //Log("atoi: (string='%s')", string);
86 // Clear non-numeric characters
87 while( !('0' <= *string && *string <= '9') && *string != '-' ) string++;
88 if( *string == '-' ) {
90 while( !('0' <= *string && *string <= '9') ) string++;
102 if('0' <= *string && *string <= '9') {
104 ret += *string - '0';
106 else if('A' <= *string && *string <= 'F') {
108 ret += *string - 'A' + 10;
110 else if('a' <= *string && *string <= 'f') {
112 ret += *string - 'a' + 10;
120 for( ; '0' <= *string && *string <= '7'; string ++ )
123 ret += *string - '0';
129 for( ; '0' <= *string && *string <= '9'; string++)
132 ret += *string - '0';
135 if( ret == 0 ) return 0;
140 //Log("atoi: RETURN %i", ret);
144 return string - orig_string;
147 static const char cUCDIGITS[] = "0123456789ABCDEF";
149 * \fn void itoa(char *buf, Uint64 num, int base, int minLength, char pad)
150 * \brief Convert an integer into a character string
152 void itoa(char *buf, Uint64 num, int base, int minLength, char pad)
162 if(base > 16 || base < 2) {
168 while(num > base-1) {
169 num = DivMod64U(num, base, &rem); // Shift `num` and get remainder
170 tmpBuf[pos] = cUCDIGITS[ rem ];
173 tmpBuf[pos++] = cUCDIGITS[ num ]; // Last digit of `num`
178 while(minLength-- > 0) buf[i++] = pad;
179 while(pos-- > 0) buf[i++] = tmpBuf[pos]; // Reverse the order of characters
184 * \brief Append a character the the vsnprintf output
186 #define PUTCH(c) _putch(c)
187 #define GETVAL() do {\
188 if(isLongLong) val = va_arg(args, Uint64);\
189 else val = va_arg(args, unsigned int);\
192 * \brief VArg String Number Print Formatted
194 int vsnprintf(char *__s, size_t __maxlen, const char *__format, va_list args)
197 int minSize = 0, precision = -1, len;
198 char tmpBuf[34]; // For Integers
199 const char *p = NULL;
206 auto void _putch(char ch);
212 if(__s) __s[pos] = ch;
217 while((c = *__format++) != 0)
219 // Non control character
220 if(c != '%') { PUTCH(c); continue; }
226 if(c == '%') { PUTCH('%'); continue; }
228 // Pointer - Done first for debugging
230 Uint ptr = va_arg(args, Uint);
231 PUTCH('*'); PUTCH('0'); PUTCH('x');
232 for( len = BITS/4; len --; )
233 PUTCH( cUCDIGITS[ (ptr>>(len*4))&15 ] );
237 // - Padding Side Flag
252 if(c == '*') { // Dynamic length
253 minSize = va_arg(args, unsigned int);
256 else if('1' <= c && c <= '9')
259 while('0' <= c && c <= '9')
274 if(c == '*') { // Dynamic length
275 precision = va_arg(args, unsigned int);
278 else if('1' <= c && c <= '9')
281 while('0' <= c && c <= '9')
284 precision += c - '0';
290 // - Default, Long or LongLong?
292 if(c == 'l') // Long is actually the default on x86
301 // - Now get the format code
308 if( isLongLong && val >> 63 ) {
312 else if( !isLongLong && val >> 31 ) {
316 itoa(tmpBuf, val, 10, minSize, pad);
318 case 'u': // Unsigned
320 itoa(tmpBuf, val, 10, minSize, pad);
322 case 'P': // Physical Address
325 if(sizeof(tPAddr) > 4) isLongLong = 1;
327 itoa(tmpBuf, val, 16, minSize, pad);
331 isLongLong = 1; // TODO: Handle non-x86 64-bit archs
333 itoa(tmpBuf, val, 16, minSize, pad);
336 case 'x': // Lower case hex
338 itoa(tmpBuf, val, 16, minSize, pad);
342 itoa(tmpBuf, val, 8, minSize, pad);
346 itoa(tmpBuf, val, 2, minSize, pad);
350 val = va_arg(args, unsigned int);
355 // String - Null Terminated Array
357 p = va_arg(args, char*); // Get Argument
358 if( !p || !CheckString(p) ) p = "(inval)"; // Avoid #PFs
362 if( !bPadLeft ) while(len++ < minSize) PUTCH(pad);
363 while(*p && precision--) PUTCH(*p++);
364 if( bPadLeft ) while(len++ < minSize) PUTCH(pad);
367 case 'C': // Non-Null Terminated Character Array
368 p = va_arg(args, char*);
369 if( !CheckMem(p, minSize) ) continue; // No #PFs please
370 if(!p) goto printString;
371 while(minSize--) PUTCH(*p++);
383 if(__s && pos != __maxlen)
392 int snprintf(char *__s, size_t __n, const char *__format, ...)
397 va_start(args, __format);
398 ret = vsnprintf(__s, __n, __format, args);
406 int sprintf(char *__s, const char *__format, ...)
411 va_start(args, __format);
412 ret = vsnprintf(__s, -1, __format, args);
425 return isalpha(c) || isdigit(c);
429 return isupper(c) || islower(c);
433 return (0 <= c && c < 128);
437 if(c == '\t') return 1;
438 if(c == ' ') return 1;
443 // TODO: Check iscntrl
444 if(c < ' ') return 1;
449 return ('0' <= c && c <= '9');
453 // TODO: Check isgraph
458 return ('a' <= c && c <= 'z');
462 if( ' ' <= c && c <= 0x7F ) return 1;
478 if(c == ' ') return 1;
479 if(c == '\t') return 1;
480 if(c == '\v') return 1;
481 if(c == '\n') return 1;
482 if(c == '\r') return 1;
487 return ('a' <= c && c <= 'z');
491 return isdigit(c) || ('a' <= c && c <= 'f') || ('A' <= c && c <= 'F');
510 * \fn int strucmp(const char *Str1, const char *Str2)
511 * \brief Compare \a Str1 and \a Str2 case-insensitively
513 int strucmp(const char *Str1, const char *Str2)
515 while(*Str1 && tolower(*Str1) == tolower(*Str2))
517 return tolower(*Str1) - tolower(*Str2);
521 * \brief Locate a byte in a string
523 char *strchr(const char *__s, int __c)
525 for( ; *__s; __s ++ )
527 if( *__s == __c ) return (char*)__s;
533 * \fn int strpos(const char *Str, char Ch)
534 * \brief Search a string for an ascii character
536 int strpos(const char *Str, char Ch)
539 for(pos=0;Str[pos];pos++)
541 if(Str[pos] == Ch) return pos;
547 * \fn size_t strlen(const char *__str)
548 * \brief Get the length of string
550 size_t strlen(const char *__str)
553 while(*__str++) ret++;
558 * \brief Copy a string to a new location
560 char *strcpy(char *__str1, const char *__str2)
563 *__str1++ = *__str2++;
564 *__str1 = '\0'; // Terminate String
569 * \brief Copy a string to a new location
570 * \note Copies at most `max` chars
572 char *strncpy(char *__str1, const char *__str2, size_t __max)
574 while(*__str2 && __max-- >= 1)
575 *__str1++ = *__str2++;
577 *__str1 = '\0'; // Terminate String
582 * \brief Append a string to another
584 char *strcat(char *__dest, const char *__src)
589 *__dest++ = *__src++;
595 * \brief Append at most \a n chars to a string from another
596 * \note At most n+1 chars are written (the dest is always zero terminated)
598 char *strncat(char *__dest, const char *__src, size_t n)
601 while(*__src && n-- >= 1)
602 *__dest++ = *__src++;
608 * \fn int strcmp(const char *str1, const char *str2)
609 * \brief Compare two strings return the difference between
610 * the first non-matching characters.
612 int strcmp(const char *str1, const char *str2)
614 while(*str1 && *str1 == *str2)
616 return *str1 - *str2;
620 * \fn int strncmp(const char *Str1, const char *Str2, size_t num)
621 * \brief Compare strings \a Str1 and \a Str2 to a maximum of \a num characters
623 int strncmp(const char *Str1, const char *Str2, size_t num)
625 if(num == 0) return 0; // TODO: Check what should officially happen here
626 while(--num && *Str1 && *Str1 == *Str2)
633 * \fn char *strdup(const char *Str)
634 * \brief Duplicates a string
636 char *strdup(const char *Str)
639 ret = malloc(strlen(Str)+1);
640 if( !ret ) return NULL;
647 * \fn char *_strdup(const char *File, int Line, const char *Str)
648 * \brief Duplicates a string
650 char *_strdup(const char *File, int Line, const char *Str)
653 ret = Heap_Allocate(File, Line, strlen(Str)+1);
654 if( !ret ) return NULL;
662 * \brief Pseudo random number generator
667 static Uint state = RANDOM_SEED;
669 // Get the next state value
670 giRandomState = (RANDOM_A*state + RANDOM_C);
671 // Check if it has changed, and if it hasn't, change it
672 if(state == old) state += RANDOM_SPRUCE;
675 // http://en.wikipedia.org/wiki/Xorshift
677 static Uint32 x = 123456789;
678 static Uint32 y = 362436069;
679 static Uint32 z = 521288629;
680 static Uint32 w = 88675123;
685 return w = w ^ (w >> 19) ^ t ^ (t >> 8);
689 void *memmove(void *__dest, const void *__src, size_t len)
693 const char *src = __src;
696 if( len == 0 || dest == src )
699 if( (tVAddr)dest > (tVAddr)src + len )
700 return memcpy(dest, src, len);
701 if( (tVAddr)dest + len < (tVAddr)src )
702 return memcpy(dest, src, len);
704 // NOTE: Assumes memcpy works forward
705 if( (tVAddr)dest < (tVAddr)src )
706 return memcpy(dest, src, len);
708 if( (tVAddr)dest < (tVAddr)src )
709 block_size = (tVAddr)src - (tVAddr)dest;
711 block_size = (tVAddr)dest - (tVAddr)src;
715 while(len >= block_size)
717 memcpy(dest, src, block_size);
722 memcpy(dest, src, len);
727 // NOTE: Strictly not libc, but lib.c is used by userland code too
729 * \name Memory Validation
733 * \brief Checks if a string resides fully in valid memory
735 int CheckString(const char *String)
740 addr = (tVAddr)String;
742 if( !MM_GetPhysAddr( addr ) )
746 bUser = MM_IsUser( addr );
748 while( *(char*)addr )
750 if( (addr & (PAGE_SIZE-1)) == 0 )
752 if(bUser && !MM_IsUser(addr) )
754 if(!bUser && !MM_GetPhysAddr(addr) )
763 * \brief Check if a sized memory region is valid memory
764 * \return Boolean success
766 int CheckMem(const void *Mem, int NumBytes)
768 return MM_IsValidBuffer( (tVAddr)Mem, NumBytes );