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Amiga Plus 2004 #11
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tab2space.c
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C/C++ Source or Header
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2004-07-25
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7KB
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362 lines
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "platform.h"
#define true 1
#define false 0
#define TABSIZE 4
#define DOS_CRLF 0
#define UNIX_LF 1
#define MAC_CR 2
typedef struct
{
Bool pushed;
int tabs;
int curcol;
int lastcol;
int maxcol;
int curline;
int pushed_char;
uint size;
uint length;
char *buf;
FILE *fp;
} Stream;
int tabsize = TABSIZE;
int endline = DOS_CRLF;
Bool tabs = false;
/*
Memory allocation functions vary from one environment to
the next, and experience shows that wrapping the local
mechanisms up provides for greater flexibility and allows
out of memory conditions to be detected in one place.
*/
void *MemAlloc(size_t size)
{
void *p;
p = malloc(size);
if (!p)
{
fprintf(stderr, "***** Out of memory! *****\n");
exit(1);
}
return p;
}
void *MemRealloc(void *old, size_t size)
{
void *p;
p = realloc(old, size);
if (!p)
{
fprintf(stderr, "***** Out of memory! *****\n");
return NULL;
}
return p;
}
void MemFree(void *p)
{
free(p);
p = NULL;
}
Stream *NewStream(FILE *fp)
{
Stream *in;
in = (Stream *)MemAlloc(sizeof(Stream));
memset(in, 0, sizeof(Stream));
in->fp = fp;
return in;
}
void FreeStream(Stream *in)
{
if (in->buf)
MemFree(in->buf);
MemFree(in);
}
void AddByte(Stream *in, uint c)
{
if (in->size + 1 >= in->length)
{
while (in->size + 1 >= in->length)
{
if (in->length == 0)
in->length = 8192;
else
in->length = in->length * 2;
}
in->buf = (char *)MemRealloc(in->buf, in->length*sizeof(char));
}
in->buf[in->size++] = (char)c;
in->buf[in->size] = '\0'; /* debug */
}
/*
Read a character from a stream, keeping track
of lines, columns etc. This is used for parsing
markup and plain text etc. A single level
pushback is allowed with UngetChar(c, in).
Returns EndOfStream if there's nothing more to read.
*/
int ReadChar(Stream *in)
{
uint c;
if (in->pushed)
{
in->pushed = false;
if (in->pushed_char == '\n')
in->curline--;
return in->pushed_char;
}
in->lastcol = in->curcol;
/* expanding tab ? */
if (in->tabs > 0)
{
in->curcol++;
in->tabs--;
return ' ';
}
/* Else go on with normal buffer: */
for (;;)
{
c = getc(in->fp);
/* end of file? */
if (c == EOF)
break;
/* coerce \r\n and isolated \r as equivalent to \n : */
if (c == '\r')
{
c = getc(in->fp);
if (c != '\n')
ungetc(c, in->fp);
c = '\n';
}
if (c == '\n')
{
if (in->maxcol < in->curcol)
in->maxcol = in->curcol;
in->curcol = 1;
in->curline++;
break;
}
if (c == '\t')
{
if (tabs)
in->curcol += tabsize - ((in->curcol - 1) % tabsize);
else /* expand to spaces */
{
in->tabs = tabsize - ((in->curcol - 1) % tabsize) - 1;
in->curcol++;
c = ' ';
}
break;
}
if (c == '\033')
break;
/* strip control characters including '\r' */
if (0 < c && c < 32)
continue;
in->curcol++;
break;
}
return c;
}
Stream *ReadFile(FILE *fin)
{
int c;
Stream *in = NewStream(fin);
while ((c = ReadChar(in)) >= 0)
AddByte(in, (uint)c);
return in;
}
void WriteFile(Stream *in, FILE *fout)
{
int i, c;
char *p;
i = in->size;
p = in->buf;
while (i--)
{
c = *p++;
if (c == '\n')
{
if (endline == DOS_CRLF)
{
putc('\r', fout);
putc('\n', fout);
}
else if (endline == UNIX_LF)
putc('\n', fout);
else if (endline == MAC_CR)
putc('\r', fout);
continue;
}
putc(c, fout);
}
}
void HelpText(FILE *errout, char *prog)
{
fprintf(errout, "%s: [options] [infile [outfile]] ...\n", prog);
fprintf(errout, "Utility to expand tabs and ensure consistent line endings\n");
fprintf(errout, "options for tab2space vers: 6th February 2003\n");
fprintf(errout, " -help or -h display this help message\n");
fprintf(errout, " -dos or -crlf set line ends to CRLF (PC-DOS/Windows - default)\n");
fprintf(errout, " -mac or -cr set line ends to CR (classic Mac OS)\n");
fprintf(errout, " -unix or -lf set line ends to LF (Unix)\n");
fprintf(errout, " -tabs preserve tabs, e.g. for Makefile\n");
fprintf(errout, " -t<n> set tabs to <n> (default is 4) spaces\n");
fprintf(errout, "\nNote this utility doesn't map spaces to tabs!\n");
}
int main(int argc, char **argv)
{
char *infile, *outfile, *prog;
FILE *fin, *fout;
Stream *in = NULL;
prog = argv[0];
while (argc > 0)
{
if (argc > 1 && argv[1][0] == '-')
{
if (strcmp(argv[1], "-help") == 0 || argv[1][1] == 'h')
{
HelpText(stdout, prog);
return 1;
}
if (strcmp(argv[1], "-dos") == 0 ||
strcmp(argv[1], "-crlf") == 0)
endline = DOS_CRLF;
else if (strcmp(argv[1], "-mac") == 0 ||
strcmp(argv[1], "-cr") == 0)
endline = MAC_CR;
else if (strcmp(argv[1], "-unix") == 0 ||
strcmp(argv[1], "-lf") == 0)
endline = UNIX_LF;
else if (strcmp(argv[1], "-tabs") == 0)
tabs = true;
else if (strncmp(argv[1], "-t", 2) == 0)
sscanf(argv[1]+2, "%d", &tabsize);
--argc;
++argv;
continue;
}
if (argc > 1)
{
infile = argv[1];
fin = fopen(infile, "rb");
}
else
{
infile = "stdin";
fin = stdin;
}
if (argc > 2)
{
outfile = argv[2];
fout = NULL;
--argc;
++argv;
}
else
{
outfile = "stdout";
fout = stdout;
}
if (fin)
{
in = ReadFile(fin);
if (fin != stdin)
fclose(fin);
if (fout != stdout)
fout = fopen(outfile, "wb");
if (fout)
{
WriteFile(in, fout);
if (fout != stdout)
fclose(fout);
}
else
fprintf(stderr, "%s - can't open \"%s\" for writing\n", prog, outfile);
FreeStream(in);
}
else
fprintf(stderr, "%s - can't open \"%s\" for reading\n", prog, infile);
--argc;
++argv;
if (argc <= 1)
break;
}
return 0;
}