diff options
Diffstat (limited to 'coreutils/uniq.c')
| -rw-r--r-- | coreutils/uniq.c | 225 |
1 files changed, 111 insertions, 114 deletions
diff --git a/coreutils/uniq.c b/coreutils/uniq.c index 965d290..1e41eaa 100644 --- a/coreutils/uniq.c +++ b/coreutils/uniq.c @@ -1,3 +1,4 @@ +/* vi: set sw=4 ts=4: */ /* * Mini uniq implementation for busybox * @@ -27,119 +28,116 @@ #include <errno.h> static const char uniq_usage[] = -"uniq [OPTION]... [INPUT [OUTPUT]]\n" -"Discard all but one of successive identical lines from INPUT (or\n" -"standard input), writing to OUTPUT (or standard output).\n" -"\n" -"\t-h\tdisplay this help and exit\n" -"\n" -"A field is a run of whitespace, then non-whitespace characters.\n" -"Fields are skipped before chars.\n" -; + "uniq [OPTION]... [INPUT [OUTPUT]]\n" + "Discard all but one of successive identical lines from INPUT (or\n" + "standard input), writing to OUTPUT (or standard output).\n" + "\n" + "\t-h\tdisplay this help and exit\n" + + "\n" + "A field is a run of whitespace, then non-whitespace characters.\n" + "Fields are skipped before chars.\n"; /* max chars in line */ #define UNIQ_MAX 4096 -typedef void (Print)(FILE *, const char *); +typedef void (Print) (FILE *, const char *); -typedef int (Decide)(const char *, const char *); +typedef int (Decide) (const char *, const char *); /* container for two lines to be compared */ typedef struct { - char *a; - char *b; - int recurrence; - FILE *in; - FILE *out; - void *func; + char *a; + char *b; + int recurrence; + FILE *in; + FILE *out; + void *func; } Subject; /* set up all the variables of a uniq operation */ -static Subject * -subject_init(Subject *self, FILE *in, FILE *out, void *func) +static Subject *subject_init(Subject * self, FILE * in, FILE * out, + void *func) { - self->a = NULL; - self->b = NULL; - self->in = in; - self->out = out; - self->func = func; - self->recurrence = 0; - return self; + self->a = NULL; + self->b = NULL; + self->in = in; + self->out = out; + self->func = func; + self->recurrence = 0; + return self; } /* point a and b to the appropriate lines; * count the recurrences (if any) of a string; */ -static Subject * -subject_next(Subject *self) +static Subject *subject_next(Subject * self) { - /* tmp line holders */ - static char line[2][UNIQ_MAX]; - static int alternator = 0; - - if (fgets(line[alternator], UNIQ_MAX, self->in)) { - self->a = self->b; - self->b = line[alternator]; - alternator ^= 1; - return self; - } + /* tmp line holders */ + static char line[2][UNIQ_MAX]; + static int alternator = 0; + + if (fgets(line[alternator], UNIQ_MAX, self->in)) { + self->a = self->b; + self->b = line[alternator]; + alternator ^= 1; + return self; + } - return NULL; + return NULL; } -static Subject * -subject_last(Subject *self) +static Subject *subject_last(Subject * self) { - self->a = self->b; - self->b = NULL; - return self; + self->a = self->b; + self->b = NULL; + return self; } -static Subject * -subject_study(Subject *self) +static Subject *subject_study(Subject * self) { - if (self->a == NULL) { - return self; - } - if (self->b == NULL) { - fprintf(self->out, "%s", self->a); + if (self->a == NULL) { + return self; + } + if (self->b == NULL) { + fprintf(self->out, "%s", self->a); + return self; + } + if (strcmp(self->a, self->b) == 0) { + self->recurrence++; + } else { + fprintf(self->out, "%s", self->a); + self->recurrence = 0; + } return self; - } - if (strcmp(self->a, self->b) == 0) { - self->recurrence++; - } else { - fprintf(self->out, "%s", self->a); - self->recurrence = 0; - } - return self; } static int -set_file_pointers(int schema, FILE **in, FILE **out, char **argv) +set_file_pointers(int schema, FILE ** in, FILE ** out, char **argv) { - switch (schema) { + switch (schema) { case 0: - *in = stdin; - *out = stdout; - break; + *in = stdin; + *out = stdout; + break; case 1: - *in = fopen(argv[0], "r"); - *out = stdout; - break; + *in = fopen(argv[0], "r"); + *out = stdout; + break; case 2: - *in = fopen(argv[0], "r"); - *out = fopen(argv[1], "w"); - break; - } - if (*in == NULL) { - fprintf(stderr, "uniq: %s: %s\n", argv[0], strerror(errno)); - return errno; - } - if (*out == NULL) { - fprintf(stderr, "uniq: %s: %s\n", argv[1], strerror(errno)); - return errno; - } - return 0; + *in = fopen(argv[0], "r"); + *out = fopen(argv[1], "w"); + break; + } + if (*in == NULL) { + fprintf(stderr, "uniq: %s: %s\n", argv[0], strerror(errno)); + return errno; + } + if (*out == NULL) { + fprintf(stderr, "uniq: %s: %s\n", argv[1], strerror(errno)); + return errno; + } + return 0; } @@ -152,45 +150,44 @@ set_file_pointers(int schema, FILE **in, FILE **out, char **argv) /* it seems like GNU/uniq only takes one or two files as an option */ /* ________________________________________________________________________ */ -int -uniq_main(int argc, char **argv) +int uniq_main(int argc, char **argv) { - int i; - char opt; - FILE *in, *out; - Subject s; - - /* parse argv[] */ - for (i = 1; i < argc; i++) { - if (argv[i][0] == '-') { - opt = argv[i][1]; - switch (opt) { - case '-': - case 'h': - usage(uniq_usage); - default: - usage(uniq_usage); - } - } else { - break; + int i; + char opt; + FILE *in, *out; + Subject s; + + /* parse argv[] */ + for (i = 1; i < argc; i++) { + if (argv[i][0] == '-') { + opt = argv[i][1]; + switch (opt) { + case '-': + case 'h': + usage(uniq_usage); + default: + usage(uniq_usage); + } + } else { + break; + } } - } - /* 0 src: stdin; dst: stdout */ - /* 1 src: file; dst: stdout */ - /* 2 src: file; dst: file */ - if (set_file_pointers((argc - 1), &in, &out, &argv[i])) { - exit(1); - } + /* 0 src: stdin; dst: stdout */ + /* 1 src: file; dst: stdout */ + /* 2 src: file; dst: file */ + if (set_file_pointers((argc - 1), &in, &out, &argv[i])) { + exit(1); + } - subject_init(&s, in, out, NULL); - while (subject_next(&s)) { + subject_init(&s, in, out, NULL); + while (subject_next(&s)) { + subject_study(&s); + } + subject_last(&s); subject_study(&s); - } - subject_last(&s); - subject_study(&s); - exit(0); + exit(0); } -/* $Id: uniq.c,v 1.6 2000/02/07 05:29:42 erik Exp $ */ +/* $Id: uniq.c,v 1.7 2000/02/08 19:58:47 erik Exp $ */ |