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431 lines
11 KiB
431 lines
11 KiB
#ifndef lint
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static char Rcs_Id[] =
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"$Id: fields.c,v 1.7 1994/01/06 05:26:37 geoff Exp $";
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#endif
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/*
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* $Log: fields.c,v $
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* Revision 1.7 1994/01/06 05:26:37 geoff
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* Get rid of all references to System V string routines, for portability
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* (sigh).
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*
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* Revision 1.6 1994/01/05 20:13:43 geoff
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* Add the maxf parameter
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*
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* Revision 1.5 1994/01/04 02:40:21 geoff
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* Make the increments settable (field_line_inc and field_field_inc).
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* Add support for the FLD_NOSHRINK flag.
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*
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* Revision 1.4 1993/09/27 17:48:02 geoff
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* Fix some lint complaints and some parenthesization errors.
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*
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* Revision 1.3 1993/09/09 01:11:11 geoff
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* Add a return value to fieldwrite. Add support for backquotes and for
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* unstripped backslashes.
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*
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* Revision 1.2 1993/08/26 00:02:50 geoff
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* Fix a stupid null-pointer bug
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*
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* Revision 1.1 1993/08/25 21:32:05 geoff
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* Initial revision
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*
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*/
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#include <stdio.h>
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#include "config.h"
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#include "fields.h"
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field_t * fieldread P ((FILE * file, char * delims,
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int flags, int maxf));
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/* Read a line with fields from a file */
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field_t * fieldmake P ((char * line, int allocated, char * delims,
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int flags, int maxf));
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/* Make a field structure from a line */
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static field_t * fieldparse P ((field_t * fieldp, char * line, char * delims,
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int flags, int maxf));
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/* Parse the fields in a line */
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static int fieldbackch P ((char * str, char ** out, int strip));
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/* Process backslash sequences */
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int fieldwrite P ((FILE * file, field_t * fieldp, int delim));
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/* Write a line with fields to a file */
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void fieldfree P ((field_t * fieldp));
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/* Free a field returned by fieldread */
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unsigned int field_field_inc = 20; /* Increment to increase # fields by */
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unsigned int field_line_inc = 512; /* Incr to increase line length by */
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#ifndef USG
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#define strchr index
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#endif /* USG */
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extern void free ();
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extern char * malloc ();
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extern char * realloc ();
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extern char * strchr ();
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extern int strlen ();
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/*
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* Read one line of the given file into a buffer, break it up into
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* fields, and return them to the caller. The field_t structure
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* returned must eventually be freed with fieldfree.
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*/
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field_t * fieldread (file, delims, flags, maxf)
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FILE * file; /* File to read lines from */
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char * delims; /* Characters to use for field delimiters */
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int flags; /* Option flags; see fields.h */
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int maxf; /* Maximum number of fields to parse */
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{
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register char * linebuf; /* Buffer to hold the line read in */
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int linemax; /* Maximum line buffer size */
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int linesize; /* Current line buffer size */
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linebuf = (char *) malloc (field_line_inc);
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if (linebuf == NULL)
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return NULL;
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linemax = field_line_inc;
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linesize = 0;
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/*
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* Read in the line.
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*/
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while (fgets (&linebuf[linesize], linemax - linesize, file)
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!= NULL)
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{
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linesize += strlen (&linebuf[linesize]);
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if (linebuf[linesize - 1] == '\n')
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break;
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else
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{
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linemax += field_line_inc;
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linebuf = (char *) realloc (linebuf, linemax);
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if (linebuf == NULL)
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return NULL;
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}
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}
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if (linesize == 0)
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{
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free (linebuf);
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return NULL;
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}
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return fieldmake (linebuf, 1, delims, flags, maxf);
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}
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field_t * fieldmake (line, allocated, delims, flags, maxf)
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char * line; /* Line to make into a field structure */
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int allocated; /* NZ if line allocated with malloc */
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char * delims; /* Characters to use for field delimiters */
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int flags; /* Option flags; see fields.h */
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int maxf; /* Maximum number of fields to parse */
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{
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register field_t * fieldp; /* Structure describing the fields */
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int linesize; /* Current line buffer size */
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fieldp = (field_t *) malloc (sizeof (field_t));
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if (fieldp == NULL)
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return NULL;
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fieldp->nfields = 0;
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fieldp->linebuf = allocated ? line : NULL;
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fieldp->fields = NULL;
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fieldp->hadnl = 0;
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linesize = strlen (line);
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if (line[linesize - 1] == '\n')
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{
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line[--linesize] = '\0';
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fieldp->hadnl = 1;
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}
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/*
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* Shrink the line buffer if necessary.
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*/
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if (allocated && (flags & FLD_NOSHRINK) == 0)
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{
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line = fieldp->linebuf =
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(char *) realloc (fieldp->linebuf, linesize + 1);
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if (fieldp->linebuf == NULL)
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{
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fieldfree (fieldp);
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return NULL;
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}
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}
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return fieldparse (fieldp, line, delims, flags, maxf);
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}
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static field_t * fieldparse (fieldp, line, delims, flags, maxf)
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register field_t * fieldp; /* Field structure to parse into */
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register char * line; /* Line to be parsed */
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char * delims; /* Characters to use for field delimiters */
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int flags; /* Option flags; see fields.h */
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int maxf; /* Maximum number of fields to parse */
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{
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int fieldmax; /* Max size of fields array */
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char * lineout; /* Where to store xlated char in line */
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char quote; /* Quote character in use */
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fieldp->nfields = 0;
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fieldmax =
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(maxf != 0 && maxf < field_field_inc) ? maxf + 2 : field_field_inc;
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fieldp->fields = (char **) malloc (fieldmax * sizeof (char *));
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if (fieldp->fields == NULL)
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{
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fieldfree (fieldp);
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return NULL;
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}
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if ((flags
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& (FLD_SHQUOTES | FLD_SNGLQUOTES | FLD_BACKQUOTES | FLD_DBLQUOTES))
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== FLD_SHQUOTES)
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flags |= FLD_SNGLQUOTES | FLD_BACKQUOTES | FLD_DBLQUOTES;
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while (1)
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{
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if (flags & FLD_RUNS)
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{
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while (*line != '\0' && strchr (delims, *line) != NULL)
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line++; /* Skip runs of delimiters */
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if (*line == '\0')
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break;
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}
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fieldp->fields[fieldp->nfields] = lineout = line;
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/*
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* Skip to the next delimiter. At the end of skipping, "line" will
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* point to either a delimiter or a null byte.
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*/
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if (flags
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& (FLD_SHQUOTES | FLD_SNGLQUOTES | FLD_BACKQUOTES
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| FLD_DBLQUOTES | FLD_BACKSLASH))
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{
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while (*line != '\0')
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{
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if (strchr (delims, *line) != NULL)
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break;
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else if (((flags & FLD_SNGLQUOTES) && *line == '\'')
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|| ((flags & FLD_BACKQUOTES) && *line == '`')
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|| ((flags & FLD_DBLQUOTES) && *line == '"'))
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{
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if ((flags & FLD_SHQUOTES) == 0
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&& line != fieldp->fields[fieldp->nfields])
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quote = '\0';
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else
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quote = *line;
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}
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else
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quote = '\0';
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if (quote == '\0')
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{
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if (*line == '\\' && (flags & FLD_BACKSLASH))
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{
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line++;
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if (*line == '\0')
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break;
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line += fieldbackch (line, &lineout,
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flags & FLD_STRIPQUOTES);
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}
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else
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*lineout++ = *line++;
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}
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else
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{
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/* Process quoted string */
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if ((flags & FLD_STRIPQUOTES) == 0)
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*lineout++ = quote;
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++line;
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while (*line != '\0')
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{
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if (*line == quote)
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{
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if ((flags & FLD_STRIPQUOTES) == 0)
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*lineout++ = quote;
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line++; /* Go on past quote */
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if ((flags & FLD_SHQUOTES) == 0)
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{
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while (*line != '\0'
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&& strchr (delims, *line) == NULL)
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line++; /* Skip to delimiter */
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}
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break;
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}
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else if (*line == '\\')
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{
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if (flags & FLD_BACKSLASH)
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{
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line++;
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if (*line == '\0')
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break;
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else
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line += fieldbackch (line, &lineout,
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flags & FLD_STRIPQUOTES);
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}
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else
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{
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*lineout++ = '\\';
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if (*++line == '\0')
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break;
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*lineout++ = *line;
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}
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}
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else
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*lineout++ = *line++;
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}
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}
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}
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}
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else
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{
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while (*line != '\0' && strchr (delims, *line) == NULL)
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line++; /* Skip to delimiter */
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lineout = line;
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}
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fieldp->nfields++;
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if (*line++ == '\0')
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break;
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if (maxf != 0 && fieldp->nfields > maxf)
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break;
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*lineout = '\0';
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if (fieldp->nfields >= fieldmax)
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{
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fieldmax += field_field_inc;
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fieldp->fields =
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(char **) realloc (fieldp->fields, fieldmax * sizeof (char *));
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if (fieldp->fields == NULL)
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{
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fieldfree (fieldp);
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return NULL;
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}
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}
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}
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/*
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* Shrink the field pointers and return the field structure.
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*/
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if ((flags & FLD_NOSHRINK) == 0 && fieldp->nfields >= fieldmax)
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{
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fieldp->fields = (char **) realloc (fieldp->fields,
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(fieldp->nfields + 1) * sizeof (char *));
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if (fieldp->fields == NULL)
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{
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fieldfree (fieldp);
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return NULL;
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}
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}
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fieldp->fields[fieldp->nfields] = NULL;
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return fieldp;
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}
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static int fieldbackch (str, out, strip)
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register char * str; /* First char of backslash sequence */
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register char ** out; /* Where to store result */
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int strip; /* NZ to convert the sequence */
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{
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register int ch; /* Character being developed */
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char * origstr; /* Original value of str */
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if (!strip)
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{
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*(*out)++ = '\\';
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if (*str != 'x' && *str != 'X' && (*str < '0' || *str > '7'))
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{
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*(*out)++ = *str;
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return *str != '\0';
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}
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}
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switch (*str)
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{
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case '\0':
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*(*out)++ = '\0';
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return 0;
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case 'a':
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*(*out)++ = '\007';
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return 1;
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case 'b':
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*(*out)++ = '\b';
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return 1;
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case 'f':
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*(*out)++ = '\f';
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return 1;
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case 'n':
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*(*out)++ = '\n';
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return 1;
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case 'r':
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*(*out)++ = '\r';
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return 1;
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case 'v':
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*(*out)++ = '\v';
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return 1;
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case 'X':
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case 'x':
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/* Hexadecimal sequence */
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origstr = str++;
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ch = 0;
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if (*str >= '0' && *str <= '9')
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ch = *str++ - '0';
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else if (*str >= 'a' && *str <= 'f')
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ch = *str++ - 'a' + 0xa;
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else if (*str >= 'A' && *str <= 'F')
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ch = *str++ - 'A' + 0xa;
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if (*str >= '0' && *str <= '9')
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ch = (ch << 4) | (*str++ - '0');
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else if (*str >= 'a' && *str <= 'f')
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ch = (ch << 4) | (*str++ - 'a' + 0xa);
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else if (*str >= 'A' && *str <= 'F')
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ch = (ch << 4) | (*str++ - 'A' + 0xa);
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break;
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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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/* Octal sequence */
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origstr = str;
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ch = *str++ - '0';
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if (*str >= '0' && *str <= '7')
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ch = (ch << 3) | (*str++ - '0');
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if (*str >= '0' && *str <= '7')
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ch = (ch << 3) | (*str++ - '0');
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break;
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default:
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*(*out)++ = *str;
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return 1;
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}
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if (strip)
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{
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*(*out)++ = ch;
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return str - origstr;
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}
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else
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{
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for (ch = 0; origstr < str; ch++)
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*(*out)++ = *origstr++;
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return ch;
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}
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}
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int fieldwrite (file, fieldp, delim)
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FILE * file; /* File to write to */
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register field_t * fieldp; /* Field structure to write */
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int delim; /* Delimiter to place between fields */
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{
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int error; /* NZ if an error occurs */
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register int fieldno; /* Number of field being written */
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error = 0;
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for (fieldno = 0; fieldno < fieldp->nfields; fieldno++)
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{
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if (fieldno != 0)
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error |= putc (delim, file) == EOF;
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error |= fputs (fieldp->fields[fieldno], file) == EOF;
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}
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if (fieldp->hadnl)
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error |= putc ('\n', file) == EOF;
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return error;
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}
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void fieldfree (fieldp)
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register field_t * fieldp; /* Field structure to free */
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{
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if (fieldp == NULL)
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return;
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if (fieldp->linebuf != NULL)
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free ((char *) fieldp->linebuf);
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if (fieldp->fields != NULL)
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free ((char *) fieldp->fields);
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free ((char *) fieldp);
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}
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