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ptx: fix some integer overflow bugs
Problem reported by Lukas Zachar at: http://bugzilla.redhat.com/1482445 * src/ptx.c (line_width, gap_size, maximum_word_length) (reference_max_width, half_line_width, before_max_width) (keyafter_max_width, truncation_string_length, compare_words) (compare_occurs, search_table, find_occurs_in_text, print_spaces) (fix_output_parameters, define_all_fields): Use ptrdiff_t, not int, for object offsets and sizes. (WORD, OCCURS): Use ptrdiff_t, not short int. (WORD_TABLE, number_of_occurs, generate_all_output): Prefer ptrdiff_t to size_t where either will do. (total_line_count, file_line_count, OCCURS, fix_output_parameters) (define_all_fields): Use intmax_t, not int, for line counts. (DELTA): Remove. All uses changed. (OCCURS, find_occurs_in_text, fix_output_parameters): Use int, not size_t, for file indexes. (tail_truncation, before_truncation, keyafter_truncation) (head_truncation, search_table, define_all_fields) (generate_all_output): Use bool for booleans. (digest_word_file, find_occurs_in_text): Use x2nrealloc instead of checking for overflow by hand. (find_occurs_in_text, fix_output_parameters, define_all_fields): Omit unnecessary cast. (fix_output_parameters): Don’t assume integers fit in 11 digits. (fix_output_parameters, define_all_fields): Use sprintf return value rather than calling strlen. (define_all_fields): Do not rely on sprintf to generate a string that may contain more than INT_MAX bytes. (main): Use xstrtoimax, not xstrtoul. Use xnmalloc to catch integer overflow.
This commit is contained in:
Paul Eggert
parent
74fcbe5225
commit
1d9765a764
194
src/ptx.c
194
src/ptx.c
@ -59,9 +59,9 @@
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/* Global definitions. */
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/* FIXME: There are many unchecked integer overflows in this file,
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that will cause this command to misbehave given large inputs or
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options. Many of the "int" values below should be "size_t" or
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something else like that. */
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and in theory they could cause this command to have undefined
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behavior given large inputs or options. This command should
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diagnose any such overflow and exit. */
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/* Program options. */
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@ -77,8 +77,8 @@ static bool gnu_extensions = true; /* trigger all GNU extensions */
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static bool auto_reference = false; /* refs are 'file_name:line_number:' */
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static bool input_reference = false; /* refs at beginning of input lines */
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static bool right_reference = false; /* output refs after right context */
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static int line_width = 72; /* output line width in characters */
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static int gap_size = 3; /* number of spaces between output fields */
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static ptrdiff_t line_width = 72; /* output line width in characters */
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static ptrdiff_t gap_size = 3; /* number of spaces between output fields */
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static const char *truncation_string = "/";
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/* string used to mark line truncations */
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static const char *macro_name = "xx"; /* macro name for roff or TeX output */
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@ -105,8 +105,8 @@ static struct regex_data context_regex; /* end of context */
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static struct regex_data word_regex; /* keyword */
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/* A BLOCK delimit a region in memory of arbitrary size, like the copy of a
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whole file. A WORD is something smaller, its length should fit in a
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short integer. A WORD_TABLE may contain several WORDs. */
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whole file. A WORD is similar, except it is intended for smaller regions.
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A WORD_TABLE may contain several WORDs. */
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typedef struct
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{
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@ -118,7 +118,7 @@ BLOCK;
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typedef struct
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{
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char *start; /* pointer to beginning of region */
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short int size; /* length of the region */
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ptrdiff_t size; /* length of the region */
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}
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WORD;
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@ -126,7 +126,7 @@ typedef struct
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{
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WORD *start; /* array of WORDs */
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size_t alloc; /* allocated length */
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size_t length; /* number of used entries */
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ptrdiff_t length; /* number of used entries */
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}
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WORD_TABLE;
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@ -149,10 +149,10 @@ static struct re_registers word_regs;
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static char word_fastmap[CHAR_SET_SIZE];
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/* Maximum length of any word read. */
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static int maximum_word_length;
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static ptrdiff_t maximum_word_length;
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/* Maximum width of any reference used. */
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static int reference_max_width;
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static ptrdiff_t reference_max_width;
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/* Ignore and Only word tables. */
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@ -162,9 +162,9 @@ static WORD_TABLE only_table; /* table of words to select */
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/* Source text table, and scanning macros. */
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static int number_input_files; /* number of text input files */
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static int total_line_count; /* total number of lines seen so far */
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static intmax_t total_line_count; /* total number of lines seen so far */
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static const char **input_file_name; /* array of text input file names */
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static int *file_line_count; /* array of 'total_line_count' values at end */
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static intmax_t *file_line_count; /* array of line count values at end */
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static BLOCK *text_buffers; /* files to study */
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@ -219,20 +219,18 @@ static BLOCK *text_buffers; /* files to study */
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When automatic references are used, the 'reference' value is the
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overall line number in all input files read so far, in this case, it
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is of type (int). When input references are used, the 'reference'
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is of type intmax_t. When input references are used, the 'reference'
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value indicates the distance between the keyword beginning and the
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start of the reference field, it is of type (DELTA) and usually
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start of the reference field, and it fits in ptrdiff_t and is usually
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negative. */
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typedef short int DELTA; /* to hold displacement within one context */
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typedef struct
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{
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WORD key; /* description of the keyword */
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DELTA left; /* distance to left context start */
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DELTA right; /* distance to right context end */
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int reference; /* reference descriptor */
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size_t file_index; /* corresponding file */
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ptrdiff_t left; /* distance to left context start */
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ptrdiff_t right; /* distance to right context end */
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intmax_t reference; /* reference descriptor */
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int file_index; /* corresponding file */
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}
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OCCURS;
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@ -241,7 +239,7 @@ OCCURS;
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static OCCURS *occurs_table[1]; /* all words retained from the read text */
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static size_t occurs_alloc[1]; /* allocated size of occurs_table */
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static size_t number_of_occurs[1]; /* number of used slots in occurs_table */
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static ptrdiff_t number_of_occurs[1]; /* number of used slots in occurs_table */
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/* Communication among output routines. */
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@ -249,10 +247,17 @@ static size_t number_of_occurs[1]; /* number of used slots in occurs_table */
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/* Indicate if special output processing is requested for each character. */
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static char edited_flag[CHAR_SET_SIZE];
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static int half_line_width; /* half of line width, reference excluded */
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static int before_max_width; /* maximum width of before field */
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static int keyafter_max_width; /* maximum width of keyword-and-after field */
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static int truncation_string_length;/* length of string that flags truncation */
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/* Half of line width, reference excluded. */
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static ptrdiff_t half_line_width;
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/* Maximum width of before field. */
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static ptrdiff_t before_max_width;
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/* Maximum width of keyword-and-after field. */
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static ptrdiff_t keyafter_max_width;
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/* Length of string that flags truncation. */
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static ptrdiff_t truncation_string_length;
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/* When context is limited by lines, wraparound may happen on final output:
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the 'head' pointer gives access to some supplementary left context which
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@ -261,16 +266,16 @@ static int truncation_string_length;/* length of string that flags truncation */
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beginning of the output line. */
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static BLOCK tail; /* tail field */
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static int tail_truncation; /* flag truncation after the tail field */
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static bool tail_truncation; /* flag truncation after the tail field */
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static BLOCK before; /* before field */
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static int before_truncation; /* flag truncation before the before field */
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static bool before_truncation; /* flag truncation before the before field */
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static BLOCK keyafter; /* keyword-and-after field */
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static int keyafter_truncation; /* flag truncation after the keyafter field */
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static bool keyafter_truncation; /* flag truncation after the keyafter field */
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static BLOCK head; /* head field */
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static int head_truncation; /* flag truncation before the head field */
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static bool head_truncation; /* flag truncation before the head field */
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static BLOCK reference; /* reference field for input reference mode */
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@ -540,8 +545,8 @@ compare_words (const void *void_first, const void *void_second)
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{
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#define first ((const WORD *) void_first)
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#define second ((const WORD *) void_second)
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int length; /* minimum of two lengths */
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int counter; /* cursor in words */
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ptrdiff_t length; /* minimum of two lengths */
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ptrdiff_t counter; /* cursor in words */
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int value; /* value of comparison */
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length = first->size < second->size ? first->size : second->size;
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@ -567,7 +572,7 @@ compare_words (const void *void_first, const void *void_second)
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}
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}
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return first->size - second->size;
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return first->size < second->size ? -1 : first->size > second->size;
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#undef first
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#undef second
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}
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@ -586,21 +591,21 @@ compare_occurs (const void *void_first, const void *void_second)
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int value;
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value = compare_words (&first->key, &second->key);
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return value == 0 ? first->key.start - second->key.start : value;
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return (value ? value
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: first->key.start < second->key.start ? -1
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: first->key.start > second->key.start);
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#undef first
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#undef second
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}
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/*------------------------------------------------------------.
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| Return !0 if WORD appears in TABLE. Uses a binary search. |
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`------------------------------------------------------------*/
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/* True if WORD appears in TABLE. Uses a binary search. */
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static int _GL_ATTRIBUTE_PURE
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static bool _GL_ATTRIBUTE_PURE
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search_table (WORD *word, WORD_TABLE *table)
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{
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int lowest; /* current lowest possible index */
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int highest; /* current highest possible index */
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int middle; /* current middle index */
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ptrdiff_t lowest; /* current lowest possible index */
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ptrdiff_t highest; /* current highest possible index */
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ptrdiff_t middle; /* current middle index */
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int value; /* value from last comparison */
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lowest = 0;
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@ -614,9 +619,9 @@ search_table (WORD *word, WORD_TABLE *table)
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else if (value > 0)
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lowest = middle + 1;
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else
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return 1;
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return true;
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}
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return 0;
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return false;
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}
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/*---------------------------------------------------------------------.
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@ -713,14 +718,8 @@ digest_word_file (const char *file_name, WORD_TABLE *table)
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if (cursor > word_start)
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{
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if (table->length == table->alloc)
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{
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if ((SIZE_MAX / sizeof *table->start - 1) / 2 < table->alloc)
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xalloc_die ();
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table->alloc = table->alloc * 2 + 1;
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table->start = xrealloc (table->start,
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table->alloc * sizeof *table->start);
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}
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table->start = x2nrealloc (table->start, &table->alloc,
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sizeof *table->start);
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table->start[table->length].start = word_start;
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table->start[table->length].size = cursor - word_start;
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table->length++;
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@ -744,13 +743,13 @@ digest_word_file (const char *file_name, WORD_TABLE *table)
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`----------------------------------------------------------------------*/
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static void
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find_occurs_in_text (size_t file_index)
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find_occurs_in_text (int file_index)
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{
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char *cursor; /* for scanning the source text */
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char *scan; /* for scanning the source text also */
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char *line_start; /* start of the current input line */
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char *line_scan; /* newlines scanned until this point */
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int reference_length; /* length of reference in input mode */
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ptrdiff_t reference_length; /* length of reference in input mode */
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WORD possible_key; /* possible key, to ease searches */
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OCCURS *occurs_cursor; /* current OCCURS under construction */
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@ -946,16 +945,9 @@ find_occurs_in_text (size_t file_index)
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where it will be constructed. */
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if (number_of_occurs[0] == occurs_alloc[0])
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{
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if ((SIZE_MAX / sizeof *occurs_table[0] - 1) / 2
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< occurs_alloc[0])
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xalloc_die ();
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occurs_alloc[0] = occurs_alloc[0] * 2 + 1;
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occurs_table[0] =
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xrealloc (occurs_table[0],
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occurs_alloc[0] * sizeof *occurs_table[0]);
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}
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occurs_table[0] = x2nrealloc (occurs_table[0],
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&occurs_alloc[0],
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sizeof *occurs_table[0]);
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occurs_cursor = occurs_table[0] + number_of_occurs[0];
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/* Define the reference field, if any. */
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@ -990,8 +982,7 @@ find_occurs_in_text (size_t file_index)
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of the reference. The reference position is simply the
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value of 'line_start'. */
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occurs_cursor->reference
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= (DELTA) (line_start - possible_key.start);
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occurs_cursor->reference = line_start - possible_key.start;
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if (reference_length > reference_max_width)
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reference_max_width = reference_length;
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}
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@ -1023,11 +1014,9 @@ find_occurs_in_text (size_t file_index)
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`-----------------------------------------*/
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static void
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print_spaces (int number)
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print_spaces (ptrdiff_t number)
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{
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int counter;
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for (counter = number; counter > 0; counter--)
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for (ptrdiff_t counter = number; counter > 0; counter--)
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putchar (' ');
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}
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@ -1200,10 +1189,9 @@ print_field (BLOCK field)
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static void
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fix_output_parameters (void)
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{
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size_t file_index; /* index in text input file arrays */
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int line_ordinal; /* line ordinal value for reference */
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char ordinal_string[12]; /* edited line ordinal for reference */
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int reference_width; /* width for the whole reference */
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int file_index; /* index in text input file arrays */
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intmax_t line_ordinal; /* line ordinal value for reference */
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ptrdiff_t reference_width; /* width for the whole reference */
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int character; /* character ordinal */
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const char *cursor; /* cursor in some constant strings */
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@ -1219,15 +1207,15 @@ fix_output_parameters (void)
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line_ordinal = file_line_count[file_index] + 1;
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if (file_index > 0)
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line_ordinal -= file_line_count[file_index - 1];
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sprintf (ordinal_string, "%d", line_ordinal);
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reference_width = strlen (ordinal_string);
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char ordinal_string[INT_BUFSIZE_BOUND (intmax_t)];
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reference_width = sprintf (ordinal_string, "%"PRIdMAX, line_ordinal);
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if (input_file_name[file_index])
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reference_width += strlen (input_file_name[file_index]);
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if (reference_width > reference_max_width)
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reference_max_width = reference_width;
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}
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reference_max_width++;
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reference.start = xmalloc ((size_t) reference_max_width + 1);
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reference.start = xmalloc (reference_max_width + 1);
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}
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/* If the reference appears to the left of the output line, reserve some
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@ -1355,14 +1343,14 @@ fix_output_parameters (void)
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static void
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define_all_fields (OCCURS *occurs)
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{
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int tail_max_width; /* allowable width of tail field */
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int head_max_width; /* allowable width of head field */
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ptrdiff_t tail_max_width; /* allowable width of tail field */
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ptrdiff_t head_max_width; /* allowable width of head field */
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char *cursor; /* running cursor in source text */
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char *left_context_start; /* start of left context */
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char *right_context_end; /* end of right context */
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char *left_field_start; /* conservative start for 'head'/'before' */
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const char *file_name; /* file name for reference */
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int line_ordinal; /* line ordinal for reference */
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intmax_t line_ordinal; /* line ordinal for reference */
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const char *buffer_start; /* start of buffered file for this occurs */
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const char *buffer_end; /* end of buffered file for this occurs */
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@ -1435,7 +1423,7 @@ define_all_fields (OCCURS *occurs)
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before_truncation = cursor > left_context_start;
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}
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else
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before_truncation = 0;
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before_truncation = false;
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SKIP_WHITE (before.start, buffer_end);
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@ -1468,11 +1456,11 @@ define_all_fields (OCCURS *occurs)
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if (tail.end > tail.start)
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{
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keyafter_truncation = 0;
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keyafter_truncation = false;
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tail_truncation = truncation_string && tail.end < right_context_end;
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}
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else
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tail_truncation = 0;
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tail_truncation = false;
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SKIP_WHITE_BACKWARDS (tail.end, tail.start);
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}
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@ -1483,7 +1471,7 @@ define_all_fields (OCCURS *occurs)
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tail.start = NULL;
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tail.end = NULL;
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tail_truncation = 0;
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tail_truncation = false;
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}
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/* 'head' could not take more columns than what has been left in the right
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@ -1506,12 +1494,12 @@ define_all_fields (OCCURS *occurs)
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if (head.end > head.start)
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{
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before_truncation = 0;
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before_truncation = false;
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head_truncation = (truncation_string
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&& head.start > left_context_start);
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}
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else
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head_truncation = 0;
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head_truncation = false;
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SKIP_WHITE (head.start, head.end);
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}
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@ -1522,7 +1510,7 @@ define_all_fields (OCCURS *occurs)
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head.start = NULL;
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head.end = NULL;
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head_truncation = 0;
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head_truncation = false;
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}
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if (auto_reference)
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@ -1540,8 +1528,8 @@ define_all_fields (OCCURS *occurs)
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if (occurs->file_index > 0)
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line_ordinal -= file_line_count[occurs->file_index - 1];
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sprintf (reference.start, "%s:%d", file_name, line_ordinal);
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reference.end = reference.start + strlen (reference.start);
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char *file_end = stpcpy (reference.start, file_name);
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reference.end = file_end + sprintf (file_end, ":%"PRIdMAX, line_ordinal);
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}
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||||
else if (input_reference)
|
||||
{
|
||||
@ -1549,7 +1537,7 @@ define_all_fields (OCCURS *occurs)
|
||||
/* Reference starts at saved position for reference and extends right
|
||||
until some white space is met. */
|
||||
|
||||
reference.start = keyafter.start + (DELTA) occurs->reference;
|
||||
reference.start = keyafter.start + occurs->reference;
|
||||
reference.end = reference.start;
|
||||
SKIP_NON_WHITE (reference.end, right_context_end);
|
||||
}
|
||||
@ -1753,7 +1741,7 @@ output_one_dumb_line (void)
|
||||
static void
|
||||
generate_all_output (void)
|
||||
{
|
||||
size_t occurs_index; /* index of keyword entry being processed */
|
||||
ptrdiff_t occurs_index; /* index of keyword entry being processed */
|
||||
OCCURS *occurs_cursor; /* current keyword entry being processed */
|
||||
|
||||
/* The following assignments are useful to provide default values in case
|
||||
@ -1762,11 +1750,11 @@ generate_all_output (void)
|
||||
|
||||
tail.start = NULL;
|
||||
tail.end = NULL;
|
||||
tail_truncation = 0;
|
||||
tail_truncation = false;
|
||||
|
||||
head.start = NULL;
|
||||
head.end = NULL;
|
||||
head_truncation = 0;
|
||||
head_truncation = false;
|
||||
|
||||
/* Loop over all keyword occurrences. */
|
||||
|
||||
@ -1946,12 +1934,12 @@ main (int argc, char **argv)
|
||||
|
||||
case 'g':
|
||||
{
|
||||
unsigned long int tmp_ulong;
|
||||
if (xstrtoul (optarg, NULL, 0, &tmp_ulong, NULL) != LONGINT_OK
|
||||
|| ! (0 < tmp_ulong && tmp_ulong <= INT_MAX))
|
||||
intmax_t tmp;
|
||||
if (! (xstrtoimax (optarg, NULL, 0, &tmp, NULL) == LONGINT_OK
|
||||
&& 0 < tmp && tmp <= PTRDIFF_MAX))
|
||||
die (EXIT_FAILURE, 0, _("invalid gap width: %s"),
|
||||
quote (optarg));
|
||||
gap_size = tmp_ulong;
|
||||
gap_size = tmp;
|
||||
break;
|
||||
}
|
||||
|
||||
@ -1973,12 +1961,12 @@ main (int argc, char **argv)
|
||||
|
||||
case 'w':
|
||||
{
|
||||
unsigned long int tmp_ulong;
|
||||
if (xstrtoul (optarg, NULL, 0, &tmp_ulong, NULL) != LONGINT_OK
|
||||
|| ! (0 < tmp_ulong && tmp_ulong <= INT_MAX))
|
||||
intmax_t tmp;
|
||||
if (! (xstrtoimax (optarg, NULL, 0, &tmp, NULL) == LONGINT_OK
|
||||
&& 0 < tmp && tmp <= PTRDIFF_MAX))
|
||||
die (EXIT_FAILURE, 0, _("invalid line width: %s"),
|
||||
quote (optarg));
|
||||
line_width = tmp_ulong;
|
||||
line_width = tmp;
|
||||
break;
|
||||
}
|
||||
|
||||
@ -2045,9 +2033,9 @@ main (int argc, char **argv)
|
||||
else if (gnu_extensions)
|
||||
{
|
||||
number_input_files = argc - optind;
|
||||
input_file_name = xmalloc (number_input_files * sizeof *input_file_name);
|
||||
file_line_count = xmalloc (number_input_files * sizeof *file_line_count);
|
||||
text_buffers = xmalloc (number_input_files * sizeof *text_buffers);
|
||||
input_file_name = xnmalloc (number_input_files, sizeof *input_file_name);
|
||||
file_line_count = xnmalloc (number_input_files, sizeof *file_line_count);
|
||||
text_buffers = xnmalloc (number_input_files, sizeof *text_buffers);
|
||||
|
||||
for (file_index = 0; file_index < number_input_files; file_index++)
|
||||
{
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user