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 unsigned long long strtoull(const char *str, char **end, int base);
20 unsigned long strtoul(const char *str, char **end, int base);
21 signed long long strtoll(const char *str, char **end, int base);
22 signed long strtol(const char *str, char **end, int base);
23 int atoi(const char *string);
24 int ParseInt(const char *string, int *Val);
25 void itoa(char *buf, Uint64 num, int base, int minLength, char pad);
26 int vsnprintf(char *__s, size_t __maxlen, const char *__format, va_list args);
27 int snprintf(char *__s, size_t __n, const char *__format, ...);
28 int sprintf(char *__s, const char *__format, ...);
29 int strucmp(const char *Str1, const char *Str2);
30 char *strchr(const char *__s, int __c);
31 int strpos(const char *Str, char Ch);
32 size_t strlen(const char *__s);
33 char *strcpy(char *__str1, const char *__str2);
34 char *strncpy(char *__str1, const char *__str2, size_t max);
35 char *strcat(char *dest, const char *source);
36 int strcmp(const char *str1, const char *str2);
37 int strncmp(const char *str1, const char *str2, size_t num);
38 char *_strdup(const char *File, int Line, const char *Str);
40 void *memmove(void *__dest, const void *__src, size_t len);
42 int CheckString(char *String);
43 int CheckMem(void *Mem, int NumBytes);
66 EXPORT(_strdup); // Takes File/Line too
74 // - Import userland stroi.c file
76 #include "../../Usermode/Libraries/libc.so_src/strtoi.c"
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(ch) do { \
187 if(pos < __maxlen) { \
188 if(__s) __s[pos] = ch; \
194 #define GETVAL() do {\
195 if(isLongLong) val = va_arg(args, Uint64);\
196 else val = va_arg(args, unsigned int);\
199 * \brief VArg String Number Print Formatted
201 int vsnprintf(char *__s, size_t __maxlen, const char *__format, va_list args)
204 int minSize = 0, precision = -1, len;
205 char tmpBuf[34]; // For Integers
206 const char *p = NULL;
213 while((c = *__format++) != 0)
215 // Non control character
216 if(c != '%') { PUTCH(c); continue; }
222 if(c == '%') { PUTCH('%'); continue; }
224 // Pointer - Done first for debugging
226 Uint ptr = va_arg(args, Uint);
227 PUTCH('*'); PUTCH('0'); PUTCH('x');
228 for( len = BITS/4; len -- && ((ptr>>(len*4))&15) == 0; )
235 PUTCH( cUCDIGITS[ (ptr>>(len*4))&15 ] );
239 // - Padding Side Flag
254 if(c == '*') { // Dynamic length
255 minSize = va_arg(args, unsigned int);
258 else if('1' <= c && c <= '9')
261 while('0' <= c && c <= '9')
276 if(c == '*') { // Dynamic length
277 precision = va_arg(args, unsigned int);
280 else if('1' <= c && c <= '9')
283 while('0' <= c && c <= '9')
286 precision += c - '0';
292 // - Default, Long or LongLong?
294 if(c == 'l') // Long is actually the default on x86
303 // - Now get the format code
310 if( isLongLong && val >> 63 ) {
314 else if( !isLongLong && val >> 31 ) {
318 itoa(tmpBuf, val, 10, minSize, pad);
320 case 'u': // Unsigned
322 itoa(tmpBuf, val, 10, minSize, pad);
324 case 'P': // Physical Address
327 if(sizeof(tPAddr) > 4) isLongLong = 1;
329 itoa(tmpBuf, val, 16, minSize, pad);
333 isLongLong = 1; // TODO: Handle non-x86 64-bit archs
335 itoa(tmpBuf, val, 16, minSize, pad);
338 case 'x': // Lower case hex
340 itoa(tmpBuf, val, 16, minSize, pad);
344 itoa(tmpBuf, val, 8, minSize, pad);
348 itoa(tmpBuf, val, 2, minSize, pad);
352 val = va_arg(args, unsigned int);
357 // String - Null Terminated Array
359 p = va_arg(args, char*); // Get Argument
360 if( !p || !CheckString(p) ) p = "(inval)"; // Avoid #PFs
364 if( !bPadLeft ) while(len++ < minSize) PUTCH(pad);
365 while(*p && precision--) { PUTCH(*p); p++;}
366 if( bPadLeft ) while(len++ < minSize) PUTCH(pad);
369 case 'C': // Non-Null Terminated Character Array
370 p = va_arg(args, char*);
371 if( !CheckMem(p, minSize) ) continue; // No #PFs please
372 if(!p) goto printString;
388 if(__s && pos != __maxlen)
397 int snprintf(char *__s, size_t __n, const char *__format, ...)
402 va_start(args, __format);
403 ret = vsnprintf(__s, __n, __format, args);
411 int sprintf(char *__s, const char *__format, ...)
416 va_start(args, __format);
417 ret = vsnprintf(__s, -1, __format, args);
430 return isalpha(c) || isdigit(c);
434 return isupper(c) || islower(c);
438 return (0 <= c && c < 128);
442 if(c == '\t') return 1;
443 if(c == ' ') return 1;
448 // TODO: Check iscntrl
449 if(c < ' ') return 1;
454 return ('0' <= c && c <= '9');
458 // TODO: Check isgraph
463 return ('a' <= c && c <= 'z');
467 if( ' ' <= c && c <= 0x7F ) return 1;
483 if(c == ' ') return 1;
484 if(c == '\t') return 1;
485 if(c == '\v') return 1;
486 if(c == '\n') return 1;
487 if(c == '\r') return 1;
492 return ('a' <= c && c <= 'z');
496 return isdigit(c) || ('a' <= c && c <= 'f') || ('A' <= c && c <= 'F');
515 * \fn int strucmp(const char *Str1, const char *Str2)
516 * \brief Compare \a Str1 and \a Str2 case-insensitively
518 int strucmp(const char *Str1, const char *Str2)
520 while(*Str1 && tolower(*Str1) == tolower(*Str2))
522 return tolower(*Str1) - tolower(*Str2);
526 * \brief Locate a byte in a string
528 char *strchr(const char *__s, int __c)
530 for( ; *__s; __s ++ )
532 if( *__s == __c ) return (char*)__s;
537 char *strrchr(const char *__s, int __c)
539 size_t ofs = strlen(__s);
540 while(--ofs && __s[ofs] != __c);
541 if( __s[ofs] == __c )
542 return (char*)__s + ofs;
547 * \fn int strpos(const char *Str, char Ch)
548 * \brief Search a string for an ascii character
550 int strpos(const char *Str, char Ch)
553 for(pos=0;Str[pos];pos++)
555 if(Str[pos] == Ch) return pos;
561 * \fn size_t strlen(const char *__str)
562 * \brief Get the length of string
564 size_t strlen(const char *__str)
567 while(*__str++) ret++;
572 * \brief Copy a string to a new location
574 char *strcpy(char *__str1, const char *__str2)
577 *__str1++ = *__str2++;
578 *__str1 = '\0'; // Terminate String
583 * \brief Copy a string to a new location
584 * \note Copies at most `max` chars
586 char *strncpy(char *__str1, const char *__str2, size_t __max)
588 while(*__str2 && __max-- >= 1)
589 *__str1++ = *__str2++;
591 *__str1 = '\0'; // Terminate String
596 * \brief Append a string to another
598 char *strcat(char *__dest, const char *__src)
603 *__dest++ = *__src++;
609 * \brief Append at most \a n chars to a string from another
610 * \note At most n+1 chars are written (the dest is always zero terminated)
612 char *strncat(char *__dest, const char *__src, size_t n)
615 while(*__src && n-- >= 1)
616 *__dest++ = *__src++;
622 * \fn int strcmp(const char *str1, const char *str2)
623 * \brief Compare two strings return the difference between
624 * the first non-matching characters.
626 int strcmp(const char *str1, const char *str2)
628 while(*str1 && *str1 == *str2)
630 return *str1 - *str2;
634 * \fn int strncmp(const char *Str1, const char *Str2, size_t num)
635 * \brief Compare strings \a Str1 and \a Str2 to a maximum of \a num characters
637 int strncmp(const char *Str1, const char *Str2, size_t num)
639 if(num == 0) return 0; // TODO: Check what should officially happen here
640 while(--num && *Str1 && *Str1 == *Str2)
647 * \fn char *strdup(const char *Str)
648 * \brief Duplicates a string
650 char *strdup(const char *Str)
653 ret = malloc(strlen(Str)+1);
654 if( !ret ) return NULL;
661 * \fn char *_strdup(const char *File, int Line, const char *Str)
662 * \brief Duplicates a string
664 char *_strdup(const char *File, int Line, const char *Str)
667 ret = Heap_Allocate(File, Line, strlen(Str)+1);
668 if( !ret ) return NULL;
676 * \brief Pseudo random number generator
681 static Uint state = RANDOM_SEED;
683 // Get the next state value
684 giRandomState = (RANDOM_A*state + RANDOM_C);
685 // Check if it has changed, and if it hasn't, change it
686 if(state == old) state += RANDOM_SPRUCE;
689 // http://en.wikipedia.org/wiki/Xorshift
691 static Uint32 x = 123456789;
692 static Uint32 y = 362436069;
693 static Uint32 z = 521288629;
694 static Uint32 w = 88675123;
699 return w = w ^ (w >> 19) ^ t ^ (t >> 8);
703 void *memmove(void *__dest, const void *__src, size_t len)
706 const char *src = __src;
709 if( len == 0 || dest == src )
712 if( (tVAddr)dest > (tVAddr)src + len )
713 return memcpy(dest, src, len);
714 if( (tVAddr)dest + len < (tVAddr)src )
715 return memcpy(dest, src, len);
717 // NOTE: Assumes memcpy works forward
718 if( (tVAddr)dest < (tVAddr)src )
719 return memcpy(dest, src, len);
723 if( (tVAddr)dest < (tVAddr)src )
724 block_size = (tVAddr)src - (tVAddr)dest;
726 block_size = (tVAddr)dest - (tVAddr)src;
730 while(len >= block_size)
732 memcpy(dest, src, block_size);
737 memcpy(dest, src, len);
740 for( int i = len; i--; )
749 // NOTE: Strictly not libc, but lib.c is used by userland code too and hence these two
752 * \name Memory Validation
756 * \brief Checks if a string resides fully in valid memory
758 int CheckString(const char *String)
763 addr = (tVAddr)String;
765 if( !MM_GetPhysAddr( (void*)addr ) )
769 bUser = MM_IsUser( addr );
771 while( *(char*)addr )
773 if( (addr & (PAGE_SIZE-1)) == 0 )
775 if(bUser && !MM_IsUser(addr) )
777 if(!bUser && !MM_GetPhysAddr((void*)addr) )
786 * \brief Check if a sized memory region is valid memory
787 * \return Boolean success
789 int CheckMem(const void *Mem, int NumBytes)
791 return MM_IsValidBuffer( (tVAddr)Mem, NumBytes );