diff options
Diffstat (limited to 'src/snprintf.c')
| -rw-r--r-- | src/snprintf.c | 428 |
1 files changed, 428 insertions, 0 deletions
diff --git a/src/snprintf.c b/src/snprintf.c new file mode 100644 index 0000000..3e07e1b --- /dev/null +++ b/src/snprintf.c @@ -0,0 +1,428 @@ +/* + * Copyright (c) 1998 Sendmail, Inc. All rights reserved. + * Copyright (c) 1997 Eric P. Allman. All rights reserved. + * Copyright (c) 1988, 1993 + * The Regents of the University of California. All rights reserved. + * + * By using this file, you agree to the terms and conditions set + * forth in the LICENSE file which can be found at the top level of + * the sendmail distribution. + * + */ + +#ifndef lint +static char sccsid[] = "@(#)snprintf.c 8.12 (Berkeley) 10/13/1998"; +#endif /* not lint */ + +#include "sendmail.h" + + /* +** SNPRINTF, VSNPRINT -- counted versions of printf +** +** These versions have been grabbed off the net. They have been +** cleaned up to compile properly and support for .precision and +** %lx has been added. +*/ + +/************************************************************** + * Original: + * Patrick Powell Tue Apr 11 09:48:21 PDT 1995 + * A bombproof version of doprnt (sm_dopr) included. + * Sigh. This sort of thing is always nasty do deal with. Note that + * the version here does not include floating point... + * + * snprintf() is used instead of sprintf() as it does limit checks + * for string length. This covers a nasty loophole. + * + * The other functions are there to prevent NULL pointers from + * causing nast effects. + **************************************************************/ + +/*static char _id[] = "$Id: snprintf.c,v 1.2 1995/10/09 11:19:47 roberto Exp $";*/ +void sm_dopr(); +char *DoprEnd; +int SnprfOverflow; + +#if !HASSNPRINTF + +/* VARARGS3 */ +int +# ifdef __STDC__ +snprintf(char *str, size_t count, const char *fmt, ...) +# else +snprintf(str, count, fmt, va_alist) + char *str; + size_t count; + const char *fmt; + va_dcl +#endif +{ + int len; + VA_LOCAL_DECL + + VA_START(fmt); + len = vsnprintf(str, count, fmt, ap); + VA_END; + return len; +} + + +# ifndef luna2 +int +vsnprintf(str, count, fmt, args) + char *str; + size_t count; + const char *fmt; + va_list args; +{ + str[0] = 0; + DoprEnd = str + count - 1; + SnprfOverflow = 0; + sm_dopr( str, fmt, args ); + if (count > 0) + DoprEnd[0] = 0; + if (SnprfOverflow && tTd(57, 2)) + printf("\nvsnprintf overflow, len = %ld, str = %s", + (long) count, shortenstring(str, MAXSHORTSTR)); + return strlen(str); +} + +# endif /* !luna2 */ +#endif /* !HASSNPRINTF */ + +/* + * sm_dopr(): poor man's version of doprintf + */ + +void fmtstr __P((char *value, int ljust, int len, int zpad, int maxwidth)); +void fmtnum __P((long value, int base, int dosign, int ljust, int len, int zpad)); +void dostr __P(( char * , int )); +char *output; +void dopr_outch __P(( int c )); +int SyslogErrno; + +void +sm_dopr( buffer, format, args ) + char *buffer; + const char *format; + va_list args; +{ + int ch; + long value; + int longflag = 0; + int pointflag = 0; + int maxwidth = 0; + char *strvalue; + int ljust; + int len; + int zpad; +# if !HASSTRERROR && !defined(ERRLIST_PREDEFINED) + extern char *sys_errlist[]; + extern int sys_nerr; +# endif + + + output = buffer; + while( (ch = *format++) != '\0' ){ + switch( ch ){ + case '%': + ljust = len = zpad = maxwidth = 0; + longflag = pointflag = 0; + nextch: + ch = *format++; + switch( ch ){ + case 0: + dostr( "**end of format**" , 0); + return; + case '-': ljust = 1; goto nextch; + case '0': /* set zero padding if len not set */ + if(len==0 && !pointflag) zpad = '0'; + case '1': case '2': case '3': + case '4': case '5': case '6': + case '7': case '8': case '9': + if (pointflag) + maxwidth = maxwidth*10 + ch - '0'; + else + len = len*10 + ch - '0'; + goto nextch; + case '*': + if (pointflag) + maxwidth = va_arg( args, int ); + else + len = va_arg( args, int ); + goto nextch; + case '.': pointflag = 1; goto nextch; + case 'l': longflag = 1; goto nextch; + case 'u': case 'U': + /*fmtnum(value,base,dosign,ljust,len,zpad) */ + if( longflag ){ + value = va_arg( args, long ); + } else { + value = va_arg( args, int ); + } + fmtnum( value, 10,0, ljust, len, zpad ); break; + case 'o': case 'O': + /*fmtnum(value,base,dosign,ljust,len,zpad) */ + if( longflag ){ + value = va_arg( args, long ); + } else { + value = va_arg( args, int ); + } + fmtnum( value, 8,0, ljust, len, zpad ); break; + case 'd': case 'D': + if( longflag ){ + value = va_arg( args, long ); + } else { + value = va_arg( args, int ); + } + fmtnum( value, 10,1, ljust, len, zpad ); break; + case 'x': + if( longflag ){ + value = va_arg( args, long ); + } else { + value = va_arg( args, int ); + } + fmtnum( value, 16,0, ljust, len, zpad ); break; + case 'X': + if( longflag ){ + value = va_arg( args, long ); + } else { + value = va_arg( args, int ); + } + fmtnum( value,-16,0, ljust, len, zpad ); break; + case 's': + strvalue = va_arg( args, char *); + if (maxwidth > 0 || !pointflag) { + if (pointflag && len > maxwidth) + len = maxwidth; /* Adjust padding */ + fmtstr( strvalue,ljust,len,zpad, maxwidth); + } + break; + case 'c': + ch = va_arg( args, int ); + dopr_outch( ch ); break; + case 'm': +#if HASSTRERROR + dostr(strerror(SyslogErrno), 0); +#else + if (SyslogErrno < 0 || SyslogErrno >= sys_nerr) + { + dostr("Error ", 0); + fmtnum(SyslogErrno, 10, 0, 0, 0, 0); + } + else + dostr((char *)sys_errlist[SyslogErrno], 0); +#endif + break; + + case '%': dopr_outch( ch ); continue; + default: + dostr( "???????" , 0); + } + break; + default: + dopr_outch( ch ); + break; + } + } + *output = 0; +} + +void +fmtstr( value, ljust, len, zpad, maxwidth ) + char *value; + int ljust, len, zpad, maxwidth; +{ + int padlen, strlen; /* amount to pad */ + + if( value == 0 ){ + value = "<NULL>"; + } + for( strlen = 0; value[strlen]; ++ strlen ); /* strlen */ + if (strlen > maxwidth && maxwidth) + strlen = maxwidth; + padlen = len - strlen; + if( padlen < 0 ) padlen = 0; + if( ljust ) padlen = -padlen; + while( padlen > 0 ) { + dopr_outch( ' ' ); + --padlen; + } + dostr( value, maxwidth ); + while( padlen < 0 ) { + dopr_outch( ' ' ); + ++padlen; + } +} + +void +fmtnum( value, base, dosign, ljust, len, zpad ) + long value; + int base, dosign, ljust, len, zpad; +{ + int signvalue = 0; + unsigned long uvalue; + char convert[20]; + int place = 0; + int padlen = 0; /* amount to pad */ + int caps = 0; + + /* DEBUGP(("value 0x%x, base %d, dosign %d, ljust %d, len %d, zpad %d\n", + value, base, dosign, ljust, len, zpad )); */ + uvalue = value; + if( dosign ){ + if( value < 0 ) { + signvalue = '-'; + uvalue = -value; + } + } + if( base < 0 ){ + caps = 1; + base = -base; + } + do{ + convert[place++] = + (caps? "0123456789ABCDEF":"0123456789abcdef") + [uvalue % (unsigned)base ]; + uvalue = (uvalue / (unsigned)base ); + }while(uvalue); + convert[place] = 0; + padlen = len - place; + if( padlen < 0 ) padlen = 0; + if( ljust ) padlen = -padlen; + /* DEBUGP(( "str '%s', place %d, sign %c, padlen %d\n", + convert,place,signvalue,padlen)); */ + if( zpad && padlen > 0 ){ + if( signvalue ){ + dopr_outch( signvalue ); + --padlen; + signvalue = 0; + } + while( padlen > 0 ){ + dopr_outch( zpad ); + --padlen; + } + } + while( padlen > 0 ) { + dopr_outch( ' ' ); + --padlen; + } + if( signvalue ) dopr_outch( signvalue ); + while( place > 0 ) dopr_outch( convert[--place] ); + while( padlen < 0 ){ + dopr_outch( ' ' ); + ++padlen; + } +} + +void +dostr( str , cut) + char *str; + int cut; +{ + if (cut) { + while(*str && cut-- > 0) dopr_outch(*str++); + } else { + while(*str) dopr_outch(*str++); + } +} + +void +dopr_outch( c ) + int c; +{ +#if 0 + if( iscntrl(c) && c != '\n' && c != '\t' ){ + c = '@' + (c & 0x1F); + if( DoprEnd == 0 || output < DoprEnd ) + *output++ = '^'; + } +#endif + if( DoprEnd == 0 || output < DoprEnd ) + *output++ = c; + else + SnprfOverflow++; +} + + /* +** QUAD_TO_STRING -- Convert a quad type to a string. +** +** Convert a quad type to a string. This must be done +** separately as %lld/%qd are not supported by snprint() +** and adding support would slow down systems which only +** emulate the data type. +** +** Parameters: +** value -- number to convert to a string. +** +** Returns: +** pointer to a string. +*/ + +char * +quad_to_string(value) + QUAD_T value; +{ + char *fmtstr; + static char buf[64]; + + /* + ** Use sprintf() instead of snprintf() since snprintf() + ** does not support %qu or %llu. The buffer is large enough + ** to hold the string so there is no danger of buffer + ** overflow. + */ + +#if NEED_PERCENTQ + fmtstr = "%qu"; +#else + fmtstr = "%llu"; +#endif + sprintf(buf, fmtstr, value); + return buf; +} + /* +** SHORTENSTRING -- return short version of a string +** +** If the string is already short, just return it. If it is too +** long, return the head and tail of the string. +** +** Parameters: +** s -- the string to shorten. +** m -- the max length of the string. +** +** Returns: +** Either s or a short version of s. +*/ + +char * +shortenstring(s, m) + register const char *s; + int m; +{ + int l; + static char buf[MAXSHORTSTR + 1]; + + l = strlen(s); + if (l < m) + return (char *) s; + if (m > MAXSHORTSTR) + m = MAXSHORTSTR; + else if (m < 10) + { + if (m < 5) + { + strncpy(buf, s, m); + buf[m] = '\0'; + return buf; + } + strncpy(buf, s, m - 3); + strcpy(buf + m - 3, "..."); + return buf; + } + m = (m - 3) / 2; + strncpy(buf, s, m); + strcpy(buf + m, "..."); + strcpy(buf + m + 3, s + l - m); + return buf; +} |