3 * - By John Hodge (thePowersGang)
6 * - Kernel-land C Library
9 #include <hal_proc.h> // For MM_*
13 #define RANDOM_SEED 0xACE55052
14 #define RANDOM_A 0x00731ADE
15 #define RANDOM_C 12345
16 #define RANDOM_SPRUCE 0xf12b039
20 unsigned long long strtoull(const char *str, char **end, int base);
21 unsigned long strtoul(const char *str, char **end, int base);
22 signed long long strtoll(const char *str, char **end, int base);
23 signed long strtol(const char *str, char **end, int base);
24 int atoi(const char *string);
25 int ParseInt(const char *string, int *Val);
26 void itoa(char *buf, Uint64 num, int base, int minLength, char pad);
27 int vsnprintf(char *__s, size_t __maxlen, const char *__format, va_list args);
28 int snprintf(char *__s, size_t __n, const char *__format, ...);
29 int sprintf(char *__s, const char *__format, ...);
30 int strucmp(const char *Str1, const char *Str2);
31 char *strchr(const char *__s, int __c);
32 int strpos(const char *Str, char Ch);
33 size_t strlen(const char *__s);
34 char *strcpy(char *__str1, const char *__str2);
35 char *strncpy(char *__str1, const char *__str2, size_t max);
36 char *strcat(char *dest, const char *source);
37 int strcmp(const char *str1, const char *str2);
38 int strncmp(const char *str1, const char *str2, size_t num);
39 char *_strdup(const char *File, int Line, const char *Str);
41 void *memmove(void *__dest, const void *__src, size_t len);
43 int CheckString(char *String);
44 int CheckMem(void *Mem, int NumBytes);
67 EXPORT(_strdup); // Takes File/Line too
75 // - Import userland stroi.c file
77 #include "../../Usermode/Libraries/libc.so_src/strtoi.c"
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)
160 ASSERTR(base >= 2, );
161 ASSERTR(base <= 16, );
167 while(num > base-1) {
168 num = DivMod64U(num, base, &rem); // Shift `num` and get remainder
170 if( rem >= base && base != 16 ) {
171 Debug("rem(%llx) >= base(%x), num=%llx", rem, base, num);
174 tmpBuf[pos] = cUCDIGITS[ rem ];
177 tmpBuf[pos++] = cUCDIGITS[ num ]; // Last digit of `num`
182 while(minLength-- > 0) buf[i++] = pad;
183 while(pos-- > 0) buf[i++] = tmpBuf[pos]; // Reverse the order of characters
188 * \brief Append a character the the vsnprintf output
190 #define PUTCH(ch) do { \
191 if(pos < __maxlen && __s) { \
198 #define GETVAL() do {\
199 if(isLongLong) val = va_arg(args, Uint64);\
200 else val = va_arg(args, unsigned int);\
203 * \brief VArg String Number Print Formatted
205 int vsnprintf(char *__s, const size_t __maxlen, const char *__format, va_list args)
208 int minSize = 0, precision = -1, len;
209 char tmpBuf[34]; // For Integers
210 const char *p = NULL;
211 int isLongLong = 0, isLong;
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 -- && ((ptr>>(len*4))&15) == 0; )
239 PUTCH( cUCDIGITS[ (ptr>>(len*4))&15 ] );
246 // - Padding Side Flag
261 if(c == '*') { // Dynamic length
262 minSize = va_arg(args, unsigned int);
265 else if('1' <= c && c <= '9')
268 while('0' <= c && c <= '9')
283 if(c == '*') { // Dynamic length
284 precision = va_arg(args, unsigned int);
287 else if('1' <= c && c <= '9')
290 while('0' <= c && c <= '9')
293 precision += c - '0';
299 // - Default, Long or LongLong?
301 if(c == 'l') // Long is actually the default on x86
311 // - Now get the format code
318 if( isLongLong && val >> 63 ) {
320 if( val == LLONG_MIN )
325 else if( !isLongLong && (val >> 31) ) {
327 val = (~val & 0xFFFFFFFF)+1;
329 itoa(tmpBuf, val, 10, minSize, pad);
331 case 'u': // Unsigned
333 itoa(tmpBuf, val, 10, minSize, pad);
335 case 'P': // Physical Address
338 if(sizeof(tPAddr) > 4) isLongLong = 1;
340 itoa(tmpBuf, val, 16, minSize, pad);
344 isLongLong = 1; // TODO: Handle non-x86 64-bit archs
346 itoa(tmpBuf, val, 16, minSize, pad);
349 case 'x': // Lower case hex
351 itoa(tmpBuf, val, 16, minSize, pad);
355 itoa(tmpBuf, val, 8, minSize, pad);
359 itoa(tmpBuf, val, 2, minSize, pad);
363 val = va_arg(args, unsigned int);
368 // String - Null Terminated Array
371 Uint16 *p16 = va_arg(args, Uint16*);
373 while( *p16 && precision-- ) {
375 p16 += ReadUTF16(p16, &cp);
376 tmp[WriteUTF8(tmp, cp)] = 0;
377 for(int i = 0; tmp[i] && i<5; i ++)
382 p = va_arg(args, char*); // Get Argument
383 if( !p || !CheckString(p) ) p = "(inval)"; // Avoid #PFs
387 if( !bPadLeft ) while(len++ < minSize) PUTCH(pad);
388 while(*p && precision--) { PUTCH(*p); p++;}
389 if( bPadLeft ) while(len++ < minSize) PUTCH(pad);
392 case 'C': // Non-Null Terminated Character Array
393 p = va_arg(args, char*);
394 if( !CheckMem(p, minSize) ) continue; // No #PFs please
395 if(!p) goto printString;
411 if(__s && pos < __maxlen)
420 int snprintf(char *__s, size_t __n, const char *__format, ...)
425 va_start(args, __format);
426 ret = vsnprintf(__s, __n, __format, args);
434 int sprintf(char *__s, const char *__format, ...)
439 va_start(args, __format);
440 ret = vsnprintf(__s, -1, __format, args);
453 return isalpha(c) || isdigit(c);
457 return isupper(c) || islower(c);
461 return (0 <= c && c < 128);
465 if(c == '\t') return 1;
466 if(c == ' ') return 1;
471 // TODO: Check iscntrl
472 if(c < ' ') return 1;
477 return ('0' <= c && c <= '9');
481 // TODO: Check isgraph
486 return ('a' <= c && c <= 'z');
490 if( ' ' <= c && c <= 0x7F ) return 1;
506 if(c == ' ') return 1;
507 if(c == '\t') return 1;
508 if(c == '\v') return 1;
509 if(c == '\n') return 1;
510 if(c == '\r') return 1;
515 return ('A' <= c && c <= 'Z');
519 return isdigit(c) || ('a' <= c && c <= 'f') || ('A' <= c && c <= 'F');
538 * \fn int strucmp(const char *Str1, const char *Str2)
539 * \brief Compare \a Str1 and \a Str2 case-insensitively
541 int strucmp(const char *Str1, const char *Str2)
543 while(*Str1 && tolower(*Str1) == tolower(*Str2))
545 return tolower(*Str1) - tolower(*Str2);
549 * \brief Locate a byte in a string
551 char *strchr(const char *__s, int __c)
553 for( ; *__s; __s ++ )
555 if( *__s == __c ) return (char*)__s;
560 char *strrchr(const char *__s, int __c)
562 size_t ofs = strlen(__s);
563 while(--ofs && __s[ofs] != __c);
564 if( __s[ofs] == __c )
565 return (char*)__s + ofs;
570 * \fn int strpos(const char *Str, char Ch)
571 * \brief Search a string for an ascii character
573 int strpos(const char *Str, char Ch)
576 for(pos=0;Str[pos];pos++)
578 if(Str[pos] == Ch) return pos;
584 * \fn size_t strlen(const char *__str)
585 * \brief Get the length of string
587 size_t strlen(const char *__str)
590 while(*__str++) ret++;
595 * \brief Copy a string to a new location
597 char *strcpy(char *__str1, const char *__str2)
600 *__str1++ = *__str2++;
601 *__str1 = '\0'; // Terminate String
606 * \brief Copy a string to a new location
607 * \note Copies at most `max` chars
609 char *strncpy(char *__str1, const char *__str2, size_t __max)
611 while(*__str2 && __max-- >= 1)
612 *__str1++ = *__str2++;
614 *__str1 = '\0'; // Terminate String
619 * \brief Append a string to another
621 char *strcat(char *__dest, const char *__src)
626 *__dest++ = *__src++;
632 * \brief Append at most \a n chars to a string from another
633 * \note At most n+1 chars are written (the dest is always zero terminated)
635 char *strncat(char *__dest, const char *__src, size_t n)
638 while(*__src && n-- >= 1)
639 *__dest++ = *__src++;
645 * \fn int strcmp(const char *str1, const char *str2)
646 * \brief Compare two strings return the difference between
647 * the first non-matching characters.
649 int strcmp(const char *str1, const char *str2)
651 while(*str1 && *str1 == *str2)
653 return *str1 - *str2;
657 * \fn int strncmp(const char *Str1, const char *Str2, size_t num)
658 * \brief Compare strings \a Str1 and \a Str2 to a maximum of \a num characters
660 int strncmp(const char *Str1, const char *Str2, size_t num)
662 if(num == 0) return 0; // TODO: Check what should officially happen here
663 while(--num && *Str1 && *Str1 == *Str2)
670 * \fn char *strdup(const char *Str)
671 * \brief Duplicates a string
673 char *strdup(const char *Str)
676 ret = malloc(strlen(Str)+1);
677 if( !ret ) return NULL;
684 * \fn char *_strdup(const char *File, int Line, const char *Str)
685 * \brief Duplicates a string
687 char *_strdup(const char *File, int Line, const char *Str)
690 ret = Heap_Allocate(File, Line, strlen(Str)+1);
691 if( !ret ) return NULL;
699 * \brief Pseudo random number generator
704 static Uint state = RANDOM_SEED;
706 // Get the next state value
707 giRandomState = (RANDOM_A*state + RANDOM_C);
708 // Check if it has changed, and if it hasn't, change it
709 if(state == old) state += RANDOM_SPRUCE;
712 // http://en.wikipedia.org/wiki/Xorshift
714 static Uint32 x = 123456789;
715 static Uint32 y = 362436069;
716 static Uint32 z = 521288629;
717 static Uint32 w = 88675123;
722 return w = w ^ (w >> 19) ^ t ^ (t >> 8);
726 void *memmove(void *__dest, const void *__src, size_t len)
729 const char *src = __src;
732 if( len == 0 || dest == src )
735 if( (tVAddr)dest > (tVAddr)src + len )
736 return memcpy(dest, src, len);
737 if( (tVAddr)dest + len < (tVAddr)src )
738 return memcpy(dest, src, len);
740 // NOTE: Assumes memcpy works forward
741 if( (tVAddr)dest < (tVAddr)src )
742 return memcpy(dest, src, len);
746 if( (tVAddr)dest < (tVAddr)src )
747 block_size = (tVAddr)src - (tVAddr)dest;
749 block_size = (tVAddr)dest - (tVAddr)src;
753 while(len >= block_size)
755 memcpy(dest, src, block_size);
760 memcpy(dest, src, len);
763 for( int i = len; i--; )
772 // NOTE: Strictly not libc, but lib.c is used by userland code too and hence these two
775 * \name Memory Validation
779 * \brief Checks if a string resides fully in valid memory
781 int CheckString(const char *String)
786 addr = (tVAddr)String;
788 if( !MM_GetPhysAddr( (void*)addr ) )
792 bUser = MM_IsUser( addr );
794 while( *(char*)addr )
796 if( (addr & (PAGE_SIZE-1)) == 0 )
798 if(bUser && !MM_IsUser(addr) )
800 if(!bUser && !MM_GetPhysAddr((void*)addr) )
809 * \brief Check if a sized memory region is valid memory
810 * \return Boolean success
812 int CheckMem(const void *Mem, int NumBytes)
814 return MM_IsValidBuffer( (tVAddr)Mem, NumBytes );