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171 lines
6.2 KiB
C
171 lines
6.2 KiB
C
/* this header file comes from libowfat, http://www.fefe.de/libowfat/ */
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#ifndef FMT_H
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#define FMT_H
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/* for size_t: */
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#include <stddef.h>
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/* for uint32_t */
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#include <stdint.h>
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/* for time_t: */
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#include <sys/types.h>
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/* for byte_copy */
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#include "byte.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define FMT_LONG 41 /* enough space to hold -2^127 in decimal, plus \0 */
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#define FMT_ULONG 40 /* enough space to hold 2^128 - 1 in decimal, plus \0 */
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#define FMT_8LONG 44 /* enough space to hold 2^128 - 1 in octal, plus \0 */
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#define FMT_XLONG 33 /* enough space to hold 2^128 - 1 in hexadecimal, plus \0 */
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#define FMT_LEN ((char *) 0) /* convenient abbreviation */
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/* This file declares routines for formatting strings and numbers in
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* various forms or encodings, either binary or text based.
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*
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* The first argument is always the destination buffer, the second
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* argument is always the value to be formatted/encoded. The return
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* value is always the number of bytes written in the output buffer.
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*
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* If you don't know how large the output will be, call the function
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* first with NULL as destination buffer and use the length it returns
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* to allocate the destination buffer.
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*
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* Note that none of these routines append a 0 terminator. If you need
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* 0 termination, call the functions like this:
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buf[fmt_ulong(buf,number)]=0;
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*/
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/* convert signed src integer -23 to ASCII '-','2','3', return number of
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* bytes of value in output format (3 in this example).
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* If dest is not NULL, write result to dest */
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size_t fmt_long(char *dest,signed long src);
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/* convert unsigned src integer 23 to ASCII '2','3', return number of
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* bytes of value in output format (2 in this example).
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* If dest is not NULL, write result to dest */
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size_t fmt_ulong(char *dest,unsigned long src);
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/* convert unsigned src integer 0x23 to ASCII '2','3', return number of
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* bytes of value in output format (2 in this example).
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* If dest is not NULL, write result to dest */
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size_t fmt_xlong(char *dest,unsigned long src);
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/* convert unsigned src integer 023 to ASCII '2','3', return number of
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* bytes of value in output format (2 in this example).
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* If dest is not NULL, write result to dest */
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size_t fmt_8long(char *dest,unsigned long src);
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/* like fmt_long but for long long */
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size_t fmt_longlong(char *dest,signed long long src);
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/* like fmt_ulong but for unsigned long long */
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size_t fmt_ulonglong(char *dest,unsigned long long src);
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/* like fmt_xlong but for unsigned long long */
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size_t fmt_xlonglong(char *dest,unsigned long long src);
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#define fmt_uint(dest,src) fmt_ulong(dest,src)
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#define fmt_int(dest,src) fmt_long(dest,src)
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#define fmt_xint(dest,src) fmt_xlong(dest,src)
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#define fmt_8int(dest,src) fmt_8long(dest,src)
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/* Like fmt_ulong, but prepend '0' while length is smaller than padto.
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* Does not truncate! */
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/* fmt_ulong0(buf,23,4) -> '0','0','2','3' return 4 */
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/* fmt_ulong0(buf,234,2) -> '2','3','4', return 3 */
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size_t fmt_ulong0(char *,unsigned long src,size_t padto);
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#define fmt_uint0(buf,src,padto) fmt_ulong0(buf,src,padto)
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/* convert src double 1.7 to ASCII '1','.','7', return length.
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* If dest is not NULL, write result to dest */
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size_t fmt_double(char *dest, double d,int max,int prec);
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/* if src is negative, write '-' and return 1.
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* if src is positive, write '+' and return 1.
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* otherwise return 0 */
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size_t fmt_plusminus(char *dest,int src);
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/* if src is negative, write '-' and return 1.
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* otherwise return 0. */
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size_t fmt_minus(char *dest,int src);
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/* copy str to dest until \0 byte, return number of copied bytes. */
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/* fmt_str(NULL,str) == strlen(str) */
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/* fmt_str(buf,str) == strcpy(buf,str), return strlen(str) */
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/* strcat(strcpy(buf,"foo"),"bar") can be written as
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* i=fmt_str(buf,"foo");
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* i+=fmt_str(buf+i,"bar");
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* buf[i]=0;
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* This is more efficient because strcat needs to scan the string to
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* find the end and append.
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*/
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size_t fmt_str(char *dest,const char *src);
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/* copy str to dest until \0 byte or limit bytes copied.
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* return number of copied bytes. */
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size_t fmt_strn(char *dest,const char *src,size_t limit);
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/* copy n bytes from src to dest, return n */
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static inline size_t fmt_copybytes(char* dest,const char* src,size_t n) {
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byte_copy(dest,n,src);
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return n;
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}
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/* "foo" -> " foo"
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* write padlen-srclen spaces, if that is >= 0. Then copy srclen
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* characters from src. Truncate only if total length is larger than
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* maxlen. Return number of characters written. */
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size_t fmt_pad(char* dest,const char* src,size_t srclen,size_t padlen,size_t maxlen);
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/* "foo" -> "foo "
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* append padlen-srclen spaces after dest, if that is >= 0. Truncate
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* only if total length is larger than maxlen. Return number of
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* characters written. */
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size_t fmt_fill(char* dest,size_t srclen,size_t padlen,size_t maxlen);
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/* 1 -> "1", 4900 -> "4.9k", 2300000 -> "2.3M" */
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size_t fmt_human(char* dest,unsigned long long l);
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/* 1 -> "1", 4900 -> "4.8k", 2300000 -> "2.2M" */
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size_t fmt_humank(char* dest,unsigned long long l);
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/* "Sun, 06 Nov 1994 08:49:37 GMT" */
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size_t fmt_httpdate(char* dest,time_t t);
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#define FMT_UTF8 5
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#define FMT_ASN1LENGTH 17 /* enough space to hold 2^128-1 */
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#define FMT_ASN1TAG 19 /* enough space to hold 2^128-1 */
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/* some variable length encodings for integers */
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size_t fmt_utf8(char* dest,uint32_t n); /* can store 0-0x7fffffff */
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size_t fmt_asn1derlength(char* dest,unsigned long long l); /* 0-0x7f: 1 byte, above that 1+bytes_needed bytes */
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size_t fmt_asn1dertag(char* dest,unsigned long long l); /* 1 byte for each 7 bits; upper bit = more bytes coming */
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/* '&' -> '&', '<' -> '<'
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* 0 is rejected
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* control characters except \t \r \n are written in escaped form
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* characters from d780 to dfff and fffe and ffff and everything above 10ffff are also rejected.
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* everything else is passed through encoded as UTF-8 */
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size_t fmt_xmlescape(char* dest,uint32_t ch);
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/* internal functions, may be independently useful */
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char fmt_tohex(char c);
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#define fmt_strm(b,...) fmt_strm_internal(b,__VA_ARGS__,(char*)0)
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size_t fmt_strm_internal(char* dest,...);
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#ifndef MAX_ALLOCA
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#define MAX_ALLOCA 100000
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#endif
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#define fmt_strm_alloca(a,...) ({ size_t len=fmt_strm((char*)0,a,__VA_ARGS__)+1; char* c=(len<MAX_ALLOCA?alloca(len):0); if (c) c[fmt_strm(c,a,__VA_ARGS__)]=0; c;})
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#ifdef __cplusplus
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}
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#endif
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#endif
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