190 lines
2.8 KiB
C
190 lines
2.8 KiB
C
#include <stdio.h>
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void skipspaces(FILE* file)
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{
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int c;
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while(1)
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{
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c=fgetc(file);
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if (c!=' ' && c!='\r' && c!='\n')
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{
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ungetc(c,file);
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return;
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}
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}
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}
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int fscanf(FILE* file,const char* format, ...)
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{
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int res;
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void* arg;
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int i;
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int c;
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int contflag;
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int longflag;
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int sign;
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long long number;
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long double rnumber;
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char* str;
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res=0;
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arg=&format;
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arg+=sizeof(const char*);
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while (*format!='\0')
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{
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if (*format!='%')
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{
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c=fgetc(file);
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if (c!=*format)
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{
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ungetc(c,file);
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return -1;
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}
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format++;
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continue;
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}
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contflag=1;
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longflag=0;
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while (*format && contflag)
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{
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switch(*format)
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{
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case '.':
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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format++;
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continue;
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break;
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case 'l':
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if (longflag==0)
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longflag=1;
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else
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longflag=2;
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format++;
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break;
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case 'L':
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longflag=2;
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format++;
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break;
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case 'f':
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case 'd':
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case 'c':
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case 's':
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case '%':
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contflag=0;
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break;
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default:
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contflag=0;
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}
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}
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if (contflag)
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break;
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switch(*format)
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{
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case '%':
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c=fgetc(file);
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if (c!='%')
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{
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ungetc(c,file);
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return -1;
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}
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res--;
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break;
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case 'd':
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number=0;
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sign=1;
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skipspaces(file);
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c=fgetc(file);
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if (c=='-')
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{
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sign=-1;
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}else if (c!='+')
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ungetc(c,file);
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contflag=0;
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while(1)
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{
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c=fgetc(file);
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if (c>='0' && c<='9')
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{
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contflag++;
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number=number*10+(c-'0');
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}else
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break;
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}
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ungetc(c,file);
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if (!contflag)
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return res;
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if (longflag<=1)
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{
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*((int*)arg)=number;
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arg+=sizeof(int);
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}else
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{
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*((long long*)arg)=number;
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arg+=sizeof(long long);
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}
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break;
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case 'c':
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c=fgetc(file);
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if (c==EOF)
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return res;
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*((char*)arg)=c;
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arg+=sizeof(char);
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break;
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case 's':
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skipspaces(file);
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contflag=0;
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str=*((char**)arg);
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arg+=sizeof(char*);
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while(1)
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{
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c=fgetc(file);
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if (c==EOF || c==' ' || c=='\n' || c=='\r')
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{
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ungetc(c,file);
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break;
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}
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*str=c;
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str++;
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contflag++;
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}
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if (!contflag)
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return res;
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break;
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case 'f':
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skipspaces(file);
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// TODO: read real numbers
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rnumber=0;
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switch (longflag)
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{
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case 0:
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*((float*)arg)=rnumber;
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arg+=sizeof(float);
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break;
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case 1:
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*((double*)arg)=rnumber;
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arg+=sizeof(double);
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break;
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case 2:
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*((long double*)arg)=rnumber;
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arg+=sizeof(long double);
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break;
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default:
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return res;
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}
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break;
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default:
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break;
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}
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format++;
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res++;
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}
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return res;
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}
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