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, ...);
28 int strucmp(const char *Str1, const char *Str2);
29 char *strchr(const char *__s, int __c);
30 int strpos(const char *Str, char Ch);
31 size_t strlen(const char *__s);
32 char *strcpy(char *__str1, const char *__str2);
33 char *strncpy(char *__str1, const char *__str2, size_t max);
34 char *strcat(char *dest, const char *source);
35 int strcmp(const char *str1, const char *str2);
36 int strncmp(const char *str1, const char *str2, size_t num);
37 char *_strdup(const char *File, int Line, const char *Str);
39 void *memmove(void *__dest, const void *__src, size_t len);
41 int CheckString(char *String);
42 int CheckMem(void *Mem, int NumBytes);
63 EXPORT(_strdup); // Takes File/Line too
72 * \brief Convert a string into an integer
74 int atoi(const char *string)
77 ParseInt(string, &ret);
80 int ParseInt(const char *string, int *Val)
84 const char *orig_string = string;
86 //Log("atoi: (string='%s')", string);
88 // Clear non-numeric characters
89 while( !('0' <= *string && *string <= '9') && *string != '-' ) string++;
90 if( *string == '-' ) {
92 while( !('0' <= *string && *string <= '9') ) string++;
104 if('0' <= *string && *string <= '9') {
106 ret += *string - '0';
108 else if('A' <= *string && *string <= 'F') {
110 ret += *string - 'A' + 10;
112 else if('a' <= *string && *string <= 'f') {
114 ret += *string - 'a' + 10;
122 for( ; '0' <= *string && *string <= '7'; string ++ )
125 ret += *string - '0';
131 for( ; '0' <= *string && *string <= '9'; string++)
134 ret += *string - '0';
137 if( ret == 0 ) return 0;
142 //Log("atoi: RETURN %i", ret);
146 return string - orig_string;
149 static const char cUCDIGITS[] = "0123456789ABCDEF";
151 * \fn void itoa(char *buf, Uint64 num, int base, int minLength, char pad)
152 * \brief Convert an integer into a character string
154 void itoa(char *buf, Uint64 num, int base, int minLength, char pad)
164 if(base > 16 || base < 2) {
170 while(num > base-1) {
171 num = DivMod64U(num, base, &rem); // Shift `num` and get remainder
172 tmpBuf[pos] = cUCDIGITS[ rem ];
175 tmpBuf[pos++] = cUCDIGITS[ num ]; // Last digit of `num`
180 while(minLength-- > 0) buf[i++] = pad;
181 while(pos-- > 0) buf[i++] = tmpBuf[pos]; // Reverse the order of characters
186 * \brief Append a character the the vsnprintf output
188 #define PUTCH(c) _putch(c)
189 #define GETVAL() do {\
190 if(isLongLong) val = va_arg(args, Uint64);\
191 else val = va_arg(args, unsigned int);\
194 * \brief VArg String Number Print Formatted
196 int vsnprintf(char *__s, size_t __maxlen, const char *__format, va_list args)
199 int minSize = 0, precision = -1, len;
200 char tmpBuf[34]; // For Integers
201 const char *p = NULL;
208 auto void _putch(char ch);
214 if(__s) __s[pos] = ch;
219 while((c = *__format++) != 0)
221 // Non control character
222 if(c != '%') { PUTCH(c); continue; }
228 if(c == '%') { PUTCH('%'); continue; }
230 // Pointer - Done first for debugging
232 Uint ptr = va_arg(args, Uint);
233 PUTCH('*'); PUTCH('0'); PUTCH('x');
234 for( len = BITS/4; len --; )
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++);
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;
373 while(minSize--) PUTCH(*p++);
385 if(__s && pos != __maxlen)
394 int snprintf(char *__s, size_t __n, const char *__format, ...)
399 va_start(args, __format);
400 ret = vsnprintf(__s, __n, __format, args);
408 int sprintf(char *__s, const char *__format, ...)
413 va_start(args, __format);
414 ret = vsnprintf(__s, -1, __format, args);
421 * \fn int tolower(int c)
422 * \brief Converts a character to lower case
426 if('A' <= c && c <= 'Z')
427 return c - 'A' + 'a';
432 * \fn int strucmp(const char *Str1, const char *Str2)
433 * \brief Compare \a Str1 and \a Str2 case-insensitively
435 int strucmp(const char *Str1, const char *Str2)
437 while(*Str1 && tolower(*Str1) == tolower(*Str2))
439 return tolower(*Str1) - tolower(*Str2);
443 * \brief Locate a byte in a string
445 char *strchr(const char *__s, int __c)
447 for( ; *__s; __s ++ )
449 if( *__s == __c ) return (char*)__s;
455 * \fn int strpos(const char *Str, char Ch)
456 * \brief Search a string for an ascii character
458 int strpos(const char *Str, char Ch)
461 for(pos=0;Str[pos];pos++)
463 if(Str[pos] == Ch) return pos;
469 * \fn size_t strlen(const char *__str)
470 * \brief Get the length of string
472 size_t strlen(const char *__str)
475 while(*__str++) ret++;
480 * \brief Copy a string to a new location
482 char *strcpy(char *__str1, const char *__str2)
485 *__str1++ = *__str2++;
486 *__str1 = '\0'; // Terminate String
491 * \brief Copy a string to a new location
492 * \note Copies at most `max` chars
494 char *strncpy(char *__str1, const char *__str2, size_t __max)
496 while(*__str2 && __max-- >= 1)
497 *__str1++ = *__str2++;
499 *__str1 = '\0'; // Terminate String
504 * \brief Append a string to another
506 char *strcat(char *__dest, const char *__src)
511 *__dest++ = *__src++;
517 * \brief Append at most \a n chars to a string from another
518 * \note At most n+1 chars are written (the dest is always zero terminated)
520 char *strncat(char *__dest, const char *__src, size_t n)
523 while(*__src && n-- >= 1)
524 *__dest++ = *__src++;
530 * \fn int strcmp(const char *str1, const char *str2)
531 * \brief Compare two strings return the difference between
532 * the first non-matching characters.
534 int strcmp(const char *str1, const char *str2)
536 while(*str1 && *str1 == *str2)
538 return *str1 - *str2;
542 * \fn int strncmp(const char *Str1, const char *Str2, size_t num)
543 * \brief Compare strings \a Str1 and \a Str2 to a maximum of \a num characters
545 int strncmp(const char *Str1, const char *Str2, size_t num)
547 if(num == 0) return 0; // TODO: Check what should officially happen here
548 while(--num && *Str1 && *Str1 == *Str2)
555 * \fn char *strdup(const char *Str)
556 * \brief Duplicates a string
558 char *strdup(const char *Str)
561 ret = malloc(strlen(Str)+1);
562 if( !ret ) return NULL;
569 * \fn char *_strdup(const char *File, int Line, const char *Str)
570 * \brief Duplicates a string
572 char *_strdup(const char *File, int Line, const char *Str)
575 ret = Heap_Allocate(File, Line, strlen(Str)+1);
576 if( !ret ) return NULL;
584 * \brief Pseudo random number generator
589 static Uint state = RANDOM_SEED;
591 // Get the next state value
592 giRandomState = (RANDOM_A*state + RANDOM_C);
593 // Check if it has changed, and if it hasn't, change it
594 if(state == old) state += RANDOM_SPRUCE;
597 // http://en.wikipedia.org/wiki/Xorshift
599 static Uint32 x = 123456789;
600 static Uint32 y = 362436069;
601 static Uint32 z = 521288629;
602 static Uint32 w = 88675123;
607 return w = w ^ (w >> 19) ^ t ^ (t >> 8);
611 void *memmove(void *__dest, const void *__src, size_t len)
615 const char *src = __src;
618 if( len == 0 || dest == src )
621 if( (tVAddr)dest > (tVAddr)src + len )
622 return memcpy(dest, src, len);
623 if( (tVAddr)dest + len < (tVAddr)src )
624 return memcpy(dest, src, len);
626 // NOTE: Assumes memcpy works forward
627 if( (tVAddr)dest < (tVAddr)src )
628 return memcpy(dest, src, len);
630 if( (tVAddr)dest < (tVAddr)src )
631 block_size = (tVAddr)src - (tVAddr)dest;
633 block_size = (tVAddr)dest - (tVAddr)src;
637 while(len >= block_size)
639 memcpy(dest, src, block_size);
644 memcpy(dest, src, len);
649 // NOTE: Strictly not libc, but lib.c is used by userland code too
651 * \name Memory Validation
655 * \brief Checks if a string resides fully in valid memory
657 int CheckString(const char *String)
662 addr = (tVAddr)String;
664 if( !MM_GetPhysAddr( addr ) )
668 bUser = MM_IsUser( addr );
670 while( *(char*)addr )
672 if( (addr & (PAGE_SIZE-1)) == 0 )
674 if(bUser && !MM_IsUser(addr) )
676 if(!bUser && !MM_GetPhysAddr(addr) )
685 * \brief Check if a sized memory region is valid memory
686 * \return Boolean success
688 int CheckMem(const void *Mem, int NumBytes)
690 return MM_IsValidBuffer( (tVAddr)Mem, NumBytes );