2 * Copyright ArcCore AB
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4 * A simple implementation of all formatted xxprintf functionallity.
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10 * What you normally would do is to print to a buffer of some kind and then
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11 * call write(). However little stack indicates that we can't place buffers
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12 * on the stack and reentrant tells us that we can't have a static buffer.
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13 * That leaves us with printing characters as it is ready. From a speed
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14 * point of view that is less than optimal, but that the way it's got to be.
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15 * (Could make a 16 long char buffer??)
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17 * This is just intended to be used as a replacement for newlibs implementation.
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18 * Newlib porting interface have the following API:
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19 * int write( int fd, char *buf, int nbytes)
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22 * Note that puts(), putc() are still the newlib variants....
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24 * printf() -> vfprintf(stdout,) -> vsnprintf(buf,)
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26 * vprintf() -> vfprintf(stdout,) -> vsnprintf(buf,)
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28 * sprintf(buf,) -> vsnprintf(buf,)
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29 * snprintf(buf,) -> vsnprintf(buf,)
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31 * IMPLEMENTATION NOTE:
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32 * - If printing more than the limit, e.g. using vsnprintf() then
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33 * the emit function will only stop printing, but not interrupted
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34 * (The code will get more complicated that way)
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35 * - ANSI-C and POSIX, streams and POSIX filenumbers.
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36 * POSIX file-numbers exist in unistd.h and are only to be used by the porting
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37 * newlib interface i.e. newlib_port.c.
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38 * The filenumber is actually just a cast of the steampointer and save in the member
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49 //#define HOST_TEST 1
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51 int arc_putchar(int fd, int c);
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52 int print(FILE *file, char **buffer, size_t n, const char *format, va_list ap);
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53 static inline int emitChar( FILE *file, char **buf, char c, int *left );
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55 int fputs( const char *s, FILE *file ) {
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56 int left = ~(size_t)0;
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58 emitChar(file,NULL,*s++,&left);
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64 int printf(const char *format, ...) {
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68 va_start(ap, format);
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69 rv = vfprintf(stdout, format, ap);
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74 int fprintf(FILE *file, const char *format, ...) {
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78 va_start(ap, format);
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79 rv = vfprintf(file, format, ap);
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84 int sprintf(char *buffer, const char *format, ...) {
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88 va_start(ap, format);
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89 rv = vsnprintf(buffer, ~(size_t)0, format, ap);
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95 int snprintf(char *buffer, size_t n, const char *format, ...) {
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99 va_start(ap, format);
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100 rv = vsnprintf(buffer, n, format, ap);
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105 int vprintf(const char *format, va_list ap) {
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106 return vfprintf(stdout, format, ap);
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109 int vsprintf(char *buffer, const char *format, va_list ap) {
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110 return vsnprintf(buffer, ~(size_t)0, format, ap);
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113 int vfprintf(FILE *file, const char *format, va_list ap) {
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115 /* Just print to stdout */
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116 rv = print(file,NULL,~(size_t)0, format,ap);
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121 int vsnprintf(char *buffer, size_t n, const char *format, va_list ap) {
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124 rv = print(NULL, &buffer, n, format,ap);
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130 * The integer only counterpart
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132 int iprintf(const char *format, ...) __attribute__ ((alias("printf")));
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133 int fiprintf(FILE *file, const char *format, ...) __attribute__ ((alias("fprintf")));
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134 int siprintf(char *buffer, const char *format, ...) __attribute__ ((alias("sprintf")));
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135 int sniprintf(char *buffer, size_t n, const char *format, ...) __attribute__ ((alias("snprintf")));
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136 int viprintf(const char *format, va_list ap) __attribute__ ((alias("vprintf")));
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137 int vsiprintf(char *buffer, const char *format, va_list ap) __attribute__ ((alias("vsprintf")));
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138 int vfiprintf(FILE *file, const char *format, va_list ap) __attribute__ ((alias("vfprintf")));
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142 * @param file The file to print to
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143 * @param buf The buffer to print to
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144 * @param c The char to print
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147 static inline int emitChar( FILE *file, char **buf, char c, int *left ) {
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148 if( (*left) == 1 ) {
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152 if( buf == NULL ) {
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157 arc_putchar((int)file->_cookie, c);
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167 #if defined(HOST_TEST)
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169 * Convert a number to a string
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171 * @param val The value to convert
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172 * @param str Pointer to a space where to put the string
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173 * @param base The base
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174 * @param negative If negative or not.
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176 void xtoa( unsigned long val, char* str, int base, int negative) {
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185 if( base < 10 && base > 16 ) {
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192 str[i++] = "0123456789abcdef"[ val % base ];
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193 } while ((val /= base) > 0);
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202 while(str > oStr) {
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209 extern void xtoa( unsigned long val, char* str, int base, int negative);
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213 #define FL_NONE (0<<0)
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214 #define FL_ZERO (1<<1)
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215 #define FL_HASH (1<<2)
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216 #define FL_SPACE (1<<3)
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217 #define FL_ALIGN_LEFT (1<<4)
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218 #define FL_TYPE_SIGNED_INT (1<<5)
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219 #define FL_TYPE_UNSIGNED_INT (1<<6)
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220 #define FL_TYPE_POINTER (1<<7)
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222 static void emitString( FILE *file, char **buffer, char *string, int width, int flags, int *left) {
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224 char *str = string;
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227 /* padding: FL_ZERO or normal ' '
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228 * align: FL_ALIGN_LEFT (left) or normal (right)
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230 pad = (flags & FL_ZERO) ? '0' : ' ';
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233 if( flags & FL_ALIGN_LEFT ) {
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234 for(i=0;str[i]; i++) {
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235 emitChar(file,buffer,str[i],left);
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239 for(;i<width;i++) {
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240 emitChar(file,buffer,pad,left);
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244 strLen = strlen(string);
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247 if( width > strLen ) {
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248 for(i=0;i<(width-strLen);i++) {
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249 emitChar(file,buffer,pad,left);
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253 for(i=0;i<strLen; i++) {
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254 emitChar(file,buffer,string[i],left);
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259 void emitInt( FILE *file, char **buffer, int val, int base, int width, int flags, int *left )
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261 char lBuf[12]; // longest is base 10, 2^32
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264 if( flags & FL_TYPE_SIGNED_INT ) {
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265 xtoa(val,str,base ,(val < 0));
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267 xtoa((unsigned)val,str,base ,0);
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270 emitString(file,buffer,str,width,flags,left);
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273 #define PRINT_CHAR(_c) *buffer++= (_c);
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277 * Write formatted output to an array with a maximum number of characters.
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279 * This is the mother of the formatted print family. The main goal here
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280 * is to be very small and memory efficient.
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284 * Flags : '-' and '0'
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285 * Width : Normal padding is supported, '*' is not.
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289 * Type : d,u,x,s,and c
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291 * @param file The file descriptor
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292 * @param buffer A pointer to the place to store the output
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293 * If NULL the output is instead
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294 * @param n The maximum number of characters to write
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295 * @param format The format string
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296 * @param ap The va list
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299 int print(FILE *file, char **buffer, size_t n, const char *format, va_list ap)
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307 while ( (ch = *format++) ) {
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313 emitChar(file,buffer,ch,&left);
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322 else if (ch == ' ')
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326 else if (ch == '-')
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328 flags = FL_ALIGN_LEFT;
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332 /* Not supported or no flag */
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340 if( (ch >= '0') && (ch <= '9') ) {
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350 emitChar(file,buffer,(char )va_arg( ap, int ),&left);
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352 else if (ch == 'd')
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354 flags |= FL_TYPE_SIGNED_INT;
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355 emitInt(file,buffer,va_arg( ap, int ),10,width,flags,&left);
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357 else if (ch == 'u')
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359 flags |= FL_TYPE_UNSIGNED_INT;
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360 emitInt(file,buffer,va_arg( ap, int ),10,width,flags,&left);
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362 else if (ch == 'x')
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364 flags |= FL_TYPE_UNSIGNED_INT;
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365 emitInt(file,buffer,va_arg( ap, int ),16,width,flags,&left);
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367 else if (ch == 'p')
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369 flags |= FL_TYPE_POINTER;
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370 emitInt(file,buffer,va_arg( ap, int ),16,width,flags,&left);
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372 else if (ch == 's')
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374 str = (char *)va_arg( ap, int );
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376 if( str == NULL ) {
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380 emitString(file,buffer,str,width,flags,&left);
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388 emitChar(file,buffer,ch,&left);
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391 // va_end(ap); // Removed, TODO: Check the va_start/va_end handling (used in calling functions also).
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394 emitChar(file,buffer,'\0',&left);
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396 return 0; // Wrong.. but for now.
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404 printf("char: %c %c = a B\n", 'a', 66);
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406 printf("string: %s = (null)\n", (char *)ptr);
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408 printf("string: %s = foobar \n", "foobar");
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410 printf("string: %2s = foobar \n", "foobar");
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411 printf("string: \"%8s\" = \" foobar\" \n", "foobar");
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413 printf("string: \"%-8s\" = \"foobar \" \n", "foobar");
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415 printf("decimal: 23 = %d \n", 23);
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416 printf("hex: c23 = %x \n", 0xc23);
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417 printf("hex: 0c23 = %04x \n", 0xc23);
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418 printf("decimal with blanks: 23 = %6d \n", 23);
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419 printf("decimal with zero: 000023 = %06d \n", 23);
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421 /* negative and large numbers */
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422 printf("decimal: -23 = %d \n", -23);
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423 printf("decimal: 4294967273 = %u \n", -23);
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424 printf("decimal: c0000000 = %x \n", 0xc0000000);
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426 printf("decimal: 00c000 = %06x \n", 0xc000);
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428 fprintf(stdout, "string: %s = foobar \n", "foobar");
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429 sprintf(buff, "string: %s = foobar \n", "foobar");
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432 snprintf(buff,10, "%s\n", "12345678901234567");
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433 printf("\"123456789\" = \"%s\"\n",buff);
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435 snprintf(buff,12, "%s\n", "abcdefghijklmn");
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436 printf("\"abcdefghijkl\" = \"%s\"\n",buff);
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