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#include <u.h>
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#include <libc.h>
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#include "String.h"
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#define isspace(c) ((c)==' ' || (c)=='\t' || (c)=='\n')
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/* Get the next field from a String.  The field is delimited by white space,
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 * single or double quotes.
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 */
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String *
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s_parse(String *from, String *to)
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{
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	if (*from->ptr == '\0')
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		return 0;
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	if (to == 0)
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		to = s_new();
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	if (*from->ptr == '\'') {
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		from->ptr++;
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		for (;*from->ptr != '\'' && *from->ptr != '\0'; from->ptr++)
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			s_putc(to, *from->ptr);
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		if (*from->ptr == '\'')
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			from->ptr++;
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	} else if (*from->ptr == '"') {
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		from->ptr++;
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		for (;*from->ptr != '"' && *from->ptr != '\0'; from->ptr++)
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			s_putc(to, *from->ptr);
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		if (*from->ptr == '"')
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			from->ptr++;
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	} else {
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		for (;!isspace(*from->ptr) && *from->ptr != '\0'; from->ptr++)
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			s_putc(to, *from->ptr);
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	}
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	s_terminate(to);
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	/* crunch trailing white */
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	while(isspace(*from->ptr))
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		from->ptr++;
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	return to;
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}