mirror of
https://github.com/michaelrsweet/mxml.git
synced 2024-11-08 13:39:58 +00:00
337baeddb5
Prep for new "standard" opaque, integer, etc. callbacks. Add new vsnprintf check. Drop old string function checks for functions we don't actually use.
377 lines
7.7 KiB
C
377 lines
7.7 KiB
C
/*
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* "$Id: mxml-string.c,v 1.2 2003/09/28 12:44:39 mike Exp $"
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*
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* String functions for mini-XML, a small XML-like file parsing library.
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*
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* Copyright 2003 by Michael Sweet.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Contents:
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*
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* mxml_strdup() - Duplicate a string.
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* mxml_vsnprintf() - Format a string into a fixed size buffer.
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*/
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/*
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* Include necessary headers...
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*/
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#include "config.h"
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/*
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* 'mxml_strdup()' - Duplicate a string.
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*/
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#ifndef HAVE_STRDUP
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char * /* O - New string pointer */
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mxml_strdup(const char *s) /* I - String to duplicate */
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{
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char *t; /* New string pointer */
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if (s == NULL)
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return (NULL);
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if ((t = malloc(strlen(s) + 1)) == NULL)
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return (NULL);
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return (strcpy(t, s));
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}
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#endif /* !HAVE_STRDUP */
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/*
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* 'mxml_strdupf()' - Format and duplicate a string.
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*/
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char * /* O - New string pointer */
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mxml_strdupf(const char *format, /* I - Printf-style format string */
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va_list ap) /* I - Pointer to additional arguments */
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{
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int bytes; /* Number of bytes required */
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char *buffer, /* String buffer */
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temp[256]; /* Small buffer for first vsnprintf */
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/*
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* First format with a tiny buffer; this will tell us how many bytes are
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* needed...
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*/
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bytes = vsnprintf(temp, sizeof(temp), format, ap);
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if (bytes < sizeof(temp))
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{
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/*
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* Hey, the formatted string fits in the tiny buffer, so just dup that...
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*/
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return (strdup(temp));
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}
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/*
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* Allocate memory for the whole thing and reformat to the new, larger
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* buffer...
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*/
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if ((buffer = calloc(1, bytes + 1)) != NULL)
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vsnprintf(buffer, bytes + 1, format, ap);
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/*
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* Return the new string...
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*/
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return (buffer);
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}
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#ifndef HAVE_VSNPRINTF
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/*
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* 'mxml_vsnprintf()' - Format a string into a fixed size buffer.
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*/
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int /* O - Number of bytes formatted */
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mxml_vsnprintf(char *buffer, /* O - Output buffer */
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size_t bufsize, /* O - Size of output buffer */
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const char *format, /* I - Printf-style format string */
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va_list ap) /* I - Pointer to additional arguments */
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{
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char *bufptr, /* Pointer to position in buffer */
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*bufend, /* Pointer to end of buffer */
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sign, /* Sign of format width */
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size, /* Size character (h, l, L) */
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type; /* Format type character */
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const char *bufformat; /* Start of format */
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int width, /* Width of field */
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prec; /* Number of characters of precision */
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char tformat[100], /* Temporary format string for sprintf() */
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temp[1024]; /* Buffer for formatted numbers */
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char *s; /* Pointer to string */
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int slen; /* Length of string */
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int bytes; /* Total number of bytes needed */
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/*
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* Loop through the format string, formatting as needed...
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*/
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bufptr = buffer;
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bufend = buffer + bufsize - 1;
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bytes = 0;
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while (*format)
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{
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if (*format == '%')
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{
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bufformat = format;
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format ++;
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if (*format == '%')
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{
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*bufptr++ = *format++;
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continue;
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}
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else if (strchr(" -+#\'", *format))
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sign = *format++;
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else
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sign = 0;
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width = 0;
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while (isdigit(*format))
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width = width * 10 + *format++ - '0';
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if (*format == '.')
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{
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format ++;
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prec = 0;
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while (isdigit(*format))
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prec = prec * 10 + *format++ - '0';
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}
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else
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prec = -1;
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if (*format == 'l' && format[1] == 'l')
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{
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size = 'L';
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format += 2;
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}
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else if (*format == 'h' || *format == 'l' || *format == 'L')
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size = *format++;
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if (!*format)
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break;
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type = *format++;
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switch (type)
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{
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case 'E' : /* Floating point formats */
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case 'G' :
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case 'e' :
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case 'f' :
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case 'g' :
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if ((format - bufformat + 1) > sizeof(tformat) ||
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(width + 2) > sizeof(temp))
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break;
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strncpy(tformat, bufformat, format - bufformat);
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tformat[format - bufformat] = '\0';
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sprintf(temp, tformat, va_arg(ap, double));
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bytes += strlen(temp);
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if (bufptr)
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{
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if ((bufptr + strlen(temp)) > bufend)
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{
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strncpy(bufptr, temp, bufend - bufptr);
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bufptr = bufend;
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break;
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}
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else
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{
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strcpy(bufptr, temp);
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bufptr += strlen(temp);
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}
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}
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break;
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case 'B' : /* Integer formats */
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case 'X' :
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case 'b' :
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case 'd' :
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case 'i' :
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case 'o' :
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case 'u' :
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case 'x' :
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if ((format - bufformat + 1) > sizeof(tformat) ||
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(width + 2) > sizeof(temp))
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break;
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strncpy(tformat, bufformat, format - bufformat);
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tformat[format - bufformat] = '\0';
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sprintf(temp, tformat, va_arg(ap, int));
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bytes += strlen(temp);
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if (bufptr)
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{
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if ((bufptr + strlen(temp)) > bufend)
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{
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strncpy(bufptr, temp, bufend - bufptr);
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bufptr = bufend;
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break;
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}
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else
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{
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strcpy(bufptr, temp);
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bufptr += strlen(temp);
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}
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}
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break;
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case 'p' : /* Pointer value */
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if ((format - bufformat + 1) > sizeof(tformat) ||
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(width + 2) > sizeof(temp))
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break;
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strncpy(tformat, bufformat, format - bufformat);
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tformat[format - bufformat] = '\0';
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sprintf(temp, tformat, va_arg(ap, void *));
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bytes += strlen(temp);
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if (bufptr)
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{
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if ((bufptr + strlen(temp)) > bufend)
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{
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strncpy(bufptr, temp, bufend - bufptr);
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bufptr = bufend;
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break;
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}
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else
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{
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strcpy(bufptr, temp);
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bufptr += strlen(temp);
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}
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}
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break;
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case 'c' : /* Character or character array */
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bytes += width;
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if (bufptr)
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{
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if (width <= 1)
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*bufptr++ = va_arg(ap, int);
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else
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{
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if ((bufptr + width) > bufend)
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width = bufend - bufptr;
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memcpy(bufptr, va_arg(ap, char *), width);
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bufptr += width;
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}
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}
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break;
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case 's' : /* String */
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if ((s = va_arg(ap, char *)) == NULL)
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s = "(null)";
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slen = strlen(s);
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if (slen > width && prec != width)
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width = slen;
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bytes += width;
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if (bufptr)
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{
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if ((bufptr + width) > bufend)
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width = bufend - bufptr;
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if (slen > width)
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slen = width;
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if (sign == '-')
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{
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strncpy(bufptr, s, slen);
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memset(bufptr + slen, ' ', width - slen);
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}
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else
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{
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memset(bufptr, ' ', width - slen);
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strncpy(bufptr + width - slen, s, slen);
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}
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bufptr += width;
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}
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break;
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case 'n' : /* Output number of chars so far */
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if ((format - bufformat + 1) > sizeof(tformat) ||
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(width + 2) > sizeof(temp))
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break;
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strncpy(tformat, bufformat, format - bufformat);
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tformat[format - bufformat] = '\0';
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sprintf(temp, tformat, va_arg(ap, int));
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bytes += strlen(temp);
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if (bufptr)
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{
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if ((bufptr + strlen(temp)) > bufend)
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{
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strncpy(bufptr, temp, bufend - bufptr);
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bufptr = bufend;
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break;
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}
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else
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{
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strcpy(bufptr, temp);
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bufptr += strlen(temp);
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}
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}
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break;
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}
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}
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else
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{
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bytes ++;
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if (bufptr && bufptr < bufend)
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*bufptr++ = *format++;
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}
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}
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/*
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* Nul-terminate the string and return the number of characters needed.
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*/
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*bufptr = '\0';
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return (bytes);
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}
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#endif /* !HAVE_VSNPRINTF */
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/*
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* End of "$Id: mxml-string.c,v 1.2 2003/09/28 12:44:39 mike Exp $".
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*/
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