69 lines
1.4 KiB
C
69 lines
1.4 KiB
C
#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <gc.h>
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const char *BLANKS = " \t";
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const char *TEXT = " 23 [dup *] i hi there fr [[] ie]nd] [] 23 ";
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char *
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trim_leading_blanks(char *str)
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{
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size_t offset = strspn(str, BLANKS);
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return (offset == strlen(str)) ? NULL : (str + offset);
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}
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int
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main(void)
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{
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char *rest, *text, *snip;
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ptrdiff_t diff;
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text = trim_leading_blanks((char *)TEXT);
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if (NULL == text) {
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/* All blanks. */
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return 1;
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}
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rest = strpbrk(text, " []");
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/*
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rest now points to a space or '[' or ']' after a term,
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-or- it is NULL if the rest of the string is a single term
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with no spaces nor brackets.
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*/
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while (NULL != rest) {
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/* How many chars have we got? */
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diff = rest - text;
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/*
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diff can be zero when there is more than one space in
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a sequence in the input string. This won't happen on
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the first iteration but it can on later iterations.
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*/
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if (diff) {
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/* Allocate space and copy out the substring. */
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snip = (char *)GC_malloc(diff + 1);
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strncat(snip, text, diff);
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printf("%s\n", snip);
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}
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/* The next char is a space or '[' or ']'. */
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if ('[' == rest[0] || ']' == rest[0]) {
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printf("%c\n", rest[0]);
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}
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text = trim_leading_blanks(++rest);
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/* calling strpbrk on NULL caused segfault! */
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rest = (NULL != text) ? strpbrk(text, " []") : text;
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}
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if (text) {
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printf("%s\n", text);
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}
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}
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