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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
/*** valid sym. character */
int readline(file,dest)
FILE *file;
char *dest;
{
char *run=dest;
int zeichen='a';
while ((!feof(file))&&(zeichen!=EOF)&&(zeichen!='\n'))
{
zeichen=fgetc(file);
if ((zeichen!=EOF)&&(zeichen!='\n')) *(run++)=zeichen;
}
*run='\0';
return 0;
}
int isblankline(line)
char *line;
{
for (; *line!='\0'; line++) if (!isspace(*line)) return 0;
return 1;
}
int linestartswidth(line,needle)
char *line;
char *needle;
{
while (isspace(*line)) line++;
return (strncmp(line,needle,strlen(needle))==0);
}
#define BUFFERSIZE 10
int main(argc, argv)
int argc;
char **argv;
{
FILE *inpfile,*outfile;
char lines[BUFFERSIZE][500],*p;
char orig[1000],dest[1000],params[1000],single[1000],save;
int BufferFill,start,z,flag;
if (argc!=3)
{
fprintf(stderr,"usage: %s <input file> <output file>\n",argv[0]);
exit(1);
}
if (strcmp(argv[1],"-")==0) inpfile=stdin;
else inpfile=fopen(argv[1],"r");
if (inpfile==NULL)
{
perror(argv[1]); return 2;
}
if (strcmp(argv[2],"-")==0) outfile=stdout;
else outfile=fopen(argv[2],"w");
if (outfile==NULL)
{
perror(argv[2]); return 2;
}
BufferFill=0;
while (!feof(inpfile))
{
if (BUFFERSIZE==BufferFill)
{
fprintf(outfile,"%s\n",lines[0]);
for (z=0; z<BufferFill; z++) strcpy(lines[z],lines[z+1]);
BufferFill--;
}
readline(inpfile,lines[BufferFill++]);
/* condition for a function header:
1. body begins with '{' or 'BEGIN' in first column
2. header searched backward until blank, comment, or preprocessor
line detected */
if ((strcmp(lines[BufferFill-1],"BEGIN")==0)||(strcmp(lines[BufferFill-1],"{")==0))
{
for (start=BufferFill-1; start>=0; start--)
if (isblankline(lines[start])) break;
else if (*lines[start]=='#') break;
else if (strncmp(lines[start],"/*",2)==0) break;
else if (strcmp(lines[start]+strlen(lines[start])-2,"*/")==0) break;
start++;
/* found: assemble source lines into a single line */
for (z=start,*orig='\0'; z<=BufferFill-2; z++)
{
p=lines[z]; while (isspace(*p)) p++; strcat(orig,p);
if (z!=BufferFill-2) strcat(orig," ");
}
/* cut function name+prefixes: parameter list starts at first '(' */
p=strchr(orig,'('); *p='\0';
sprintf(dest,"\t%s",orig); strcat(dest,"("); strcpy(orig,p+1);
/* cut trailing ')' */
for (p=orig+strlen(orig)-1; *p!=')'; p--); *p='\0';
/* loop through parameters: discard 'void' entries */
*params=0; flag=0;
while (*orig!='\0')
{
p=strchr(orig,',');
if (p==NULL)
{
strcpy(single,orig); *orig='\0';
}
else
{
*p='\0'; strcpy(single,orig); strcpy(orig,p+1);
}
for (p=single; isspace(*p); p++); strcpy(single,p);
for (p=single+strlen(single)-1; isspace(*p); p--); p[1]='\0';
if (strncmp(single,"const ",6)==0) strcpy(single,single+6);
if (strcmp(single,"void")!=0)
{
strcat(params,single); strcat(params,";\n");
for (p=single+strlen(single)-1; (isalnum(*p))||(*p=='_'); p--);
if (flag) strcat(dest,","); strcat(dest,p+1); flag=1;
}
}
/* close function head */
strcat(dest,")");
/* flush contents berore header from buffer */
for (z=0; z<start; fprintf(outfile,"%s\n",lines[z++]));
/* print K&R header; don't forget opening of function body! */
fprintf(outfile,"%s\n%sBEGIN\n",dest,params);
/* flush buffer */
BufferFill=0;
}
/* Detect 'extern' definitions in header files */
else if (linestartswidth(lines[BufferFill-1],"extern "))
{
/* find opening parenthesis. if none, it's a variable definition */
p=strchr(lines[BufferFill-1],'(');
if (p!=NULL)
{
/* if next character is a '*', we have an external definition of
a function pointer and have to find the next '(' */
if (p[1]=='*') p=strchr(p+1,'(');
/* copy out first part, extend by ');' and write the 'prototype'.
flush line buffer before. */
save=p[1];
p[1]='\0'; strcpy(dest,lines[BufferFill-1]); strcat(dest,");");
p[1]=save;
for (z=0; z<BufferFill-1; fprintf(outfile,"%s\n",lines[z++]));
fprintf(outfile,"%s\n",dest);
/* discard lines until end of prototype */
strcpy(dest,lines[BufferFill-1]); BufferFill=0;
while (strcmp(dest+strlen(dest)-2,");")!=0)
{
readline(inpfile,dest);
}
}
}
}
for (z=0; z<BufferFill; fprintf(outfile,"%s\n",lines[z++]));
fclose(inpfile); fclose(outfile);
return 0;
}
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