dbg-snprintf.c

00001 #include <stdio.h>
00002 #include <strformat.h>
00003 #include <string.h>
00004 
00005 struct FmtBuffer
00006 {
00007   char *pos;
00008   size_t left;
00009 };
00010 
00011 static StrFormatResult
00012 buffer_str(void *user_data, const char *data, unsigned int len)
00013 {
00014   struct FmtBuffer *buffer = (struct FmtBuffer*)user_data;
00015   if (len >= buffer->left) {
00016     len = buffer->left;
00017     len--;
00018   }
00019     
00020   memcpy(buffer->pos, data, len);
00021   buffer->pos += len;
00022   buffer->left -= len;
00023   return STRFORMAT_OK;
00024 }
00025 
00026 int snprintf(char *str, size_t size, const char *format, ...)
00027 {
00028   int res;
00029   va_list ap;
00030   va_start(ap, format);
00031   res = vsnprintf(str, size, format, ap);
00032   va_end(ap);
00033   return res;
00034 }
00035 
00036 int vsnprintf(char *str, size_t size, const char *format, va_list ap)
00037 {
00038   struct FmtBuffer buffer;
00039   StrFormatContext ctxt;
00040   int res;
00041   ctxt.write_str = buffer_str;
00042   ctxt.user_data = &buffer;
00043   buffer.pos = str;
00044   buffer.left = size;
00045   res = format_str_v(&ctxt, format, ap);
00046   *buffer.pos = '\0';
00047   return res;
00048 }

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