Some formatting updates (ran the code through indent)
-Erik
This commit is contained in:
Erik Andersen
225
coreutils/uniq.c
225
coreutils/uniq.c
@ -1,3 +1,4 @@
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/* vi: set sw=4 ts=4: */
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/*
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* Mini uniq implementation for busybox
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*
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@ -27,119 +28,116 @@
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#include <errno.h>
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static const char uniq_usage[] =
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"uniq [OPTION]... [INPUT [OUTPUT]]\n"
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"Discard all but one of successive identical lines from INPUT (or\n"
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"standard input), writing to OUTPUT (or standard output).\n"
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"\n"
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"\t-h\tdisplay this help and exit\n"
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"\n"
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"A field is a run of whitespace, then non-whitespace characters.\n"
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"Fields are skipped before chars.\n"
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;
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"uniq [OPTION]... [INPUT [OUTPUT]]\n"
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"Discard all but one of successive identical lines from INPUT (or\n"
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"standard input), writing to OUTPUT (or standard output).\n"
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"\n"
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"\t-h\tdisplay this help and exit\n"
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"\n"
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"A field is a run of whitespace, then non-whitespace characters.\n"
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"Fields are skipped before chars.\n";
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/* max chars in line */
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#define UNIQ_MAX 4096
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typedef void (Print)(FILE *, const char *);
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typedef void (Print) (FILE *, const char *);
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typedef int (Decide)(const char *, const char *);
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typedef int (Decide) (const char *, const char *);
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/* container for two lines to be compared */
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typedef struct {
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char *a;
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char *b;
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int recurrence;
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FILE *in;
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FILE *out;
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void *func;
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char *a;
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char *b;
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int recurrence;
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FILE *in;
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FILE *out;
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void *func;
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} Subject;
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/* set up all the variables of a uniq operation */
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static Subject *
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subject_init(Subject *self, FILE *in, FILE *out, void *func)
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static Subject *subject_init(Subject * self, FILE * in, FILE * out,
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void *func)
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{
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self->a = NULL;
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self->b = NULL;
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self->in = in;
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self->out = out;
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self->func = func;
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self->recurrence = 0;
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return self;
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self->a = NULL;
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self->b = NULL;
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self->in = in;
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self->out = out;
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self->func = func;
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self->recurrence = 0;
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return self;
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}
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/* point a and b to the appropriate lines;
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* count the recurrences (if any) of a string;
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*/
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static Subject *
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subject_next(Subject *self)
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static Subject *subject_next(Subject * self)
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{
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/* tmp line holders */
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static char line[2][UNIQ_MAX];
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static int alternator = 0;
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/* tmp line holders */
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static char line[2][UNIQ_MAX];
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static int alternator = 0;
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if (fgets(line[alternator], UNIQ_MAX, self->in)) {
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if (fgets(line[alternator], UNIQ_MAX, self->in)) {
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self->a = self->b;
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self->b = line[alternator];
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alternator ^= 1;
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return self;
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}
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return NULL;
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}
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static Subject *subject_last(Subject * self)
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{
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self->a = self->b;
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self->b = line[alternator];
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alternator ^= 1;
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self->b = NULL;
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return self;
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}
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return NULL;
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}
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static Subject *
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subject_last(Subject *self)
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static Subject *subject_study(Subject * self)
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{
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self->a = self->b;
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self->b = NULL;
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return self;
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}
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static Subject *
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subject_study(Subject *self)
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{
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if (self->a == NULL) {
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if (self->a == NULL) {
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return self;
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}
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if (self->b == NULL) {
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fprintf(self->out, "%s", self->a);
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return self;
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}
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if (strcmp(self->a, self->b) == 0) {
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self->recurrence++;
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} else {
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fprintf(self->out, "%s", self->a);
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self->recurrence = 0;
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}
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return self;
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}
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if (self->b == NULL) {
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fprintf(self->out, "%s", self->a);
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return self;
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}
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if (strcmp(self->a, self->b) == 0) {
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self->recurrence++;
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} else {
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fprintf(self->out, "%s", self->a);
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self->recurrence = 0;
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}
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return self;
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}
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static int
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set_file_pointers(int schema, FILE **in, FILE **out, char **argv)
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set_file_pointers(int schema, FILE ** in, FILE ** out, char **argv)
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{
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switch (schema) {
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switch (schema) {
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case 0:
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*in = stdin;
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*out = stdout;
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break;
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*in = stdin;
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*out = stdout;
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break;
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case 1:
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*in = fopen(argv[0], "r");
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*out = stdout;
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break;
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*in = fopen(argv[0], "r");
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*out = stdout;
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break;
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case 2:
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*in = fopen(argv[0], "r");
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*out = fopen(argv[1], "w");
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break;
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}
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if (*in == NULL) {
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fprintf(stderr, "uniq: %s: %s\n", argv[0], strerror(errno));
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return errno;
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}
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if (*out == NULL) {
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fprintf(stderr, "uniq: %s: %s\n", argv[1], strerror(errno));
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return errno;
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}
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return 0;
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*in = fopen(argv[0], "r");
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*out = fopen(argv[1], "w");
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break;
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}
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if (*in == NULL) {
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fprintf(stderr, "uniq: %s: %s\n", argv[0], strerror(errno));
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return errno;
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}
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if (*out == NULL) {
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fprintf(stderr, "uniq: %s: %s\n", argv[1], strerror(errno));
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return errno;
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}
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return 0;
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}
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@ -152,45 +150,44 @@ set_file_pointers(int schema, FILE **in, FILE **out, char **argv)
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/* it seems like GNU/uniq only takes one or two files as an option */
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/* ________________________________________________________________________ */
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int
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uniq_main(int argc, char **argv)
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int uniq_main(int argc, char **argv)
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{
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int i;
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char opt;
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FILE *in, *out;
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Subject s;
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int i;
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char opt;
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FILE *in, *out;
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Subject s;
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/* parse argv[] */
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for (i = 1; i < argc; i++) {
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if (argv[i][0] == '-') {
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opt = argv[i][1];
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switch (opt) {
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case '-':
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case 'h':
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usage(uniq_usage);
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default:
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usage(uniq_usage);
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}
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} else {
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break;
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/* parse argv[] */
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for (i = 1; i < argc; i++) {
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if (argv[i][0] == '-') {
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opt = argv[i][1];
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switch (opt) {
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case '-':
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case 'h':
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usage(uniq_usage);
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default:
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usage(uniq_usage);
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}
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} else {
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break;
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}
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}
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}
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/* 0 src: stdin; dst: stdout */
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/* 1 src: file; dst: stdout */
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/* 2 src: file; dst: file */
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if (set_file_pointers((argc - 1), &in, &out, &argv[i])) {
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exit(1);
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}
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/* 0 src: stdin; dst: stdout */
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/* 1 src: file; dst: stdout */
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/* 2 src: file; dst: file */
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if (set_file_pointers((argc - 1), &in, &out, &argv[i])) {
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exit(1);
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}
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subject_init(&s, in, out, NULL);
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while (subject_next(&s)) {
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subject_init(&s, in, out, NULL);
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while (subject_next(&s)) {
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subject_study(&s);
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}
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subject_last(&s);
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subject_study(&s);
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}
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subject_last(&s);
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subject_study(&s);
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exit(0);
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exit(0);
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}
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/* $Id: uniq.c,v 1.6 2000/02/07 05:29:42 erik Exp $ */
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/* $Id: uniq.c,v 1.7 2000/02/08 19:58:47 erik Exp $ */
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