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disk_179
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unixutil
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head.c
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C/C++ Source or Header
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1992-05-06
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2KB
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95 lines
/* head.c - print the first few lines in a file. If count is specified,*
* that many lines are printed instead of the default value of *
* ten lines. If no files are specified, head reads standard *
* input. *
* *
* head [-<count>] [<file> ...] *
* *
* head (C) 1988 by Gary L. Brant *
* *
* :ts=8 */
#include <stdio.h>
#define MAXLINE 1000
void fputs ();
int head = 0;
main (argc, argv) /* list 1st n lines of a file */
int argc;
char *argv[];
{
FILE *input, *fopen ();
void fclose ();
int default_lines = 10; /* default number of lines to list */
int i = 0, j, maxlines;
char ch;
maxlines = default_lines;
while (++i < argc) {
if (argv [i][0] == '-') { /* remember to bump i in loop */
maxlines = 0; /* remember to set maxlines to 0 1st */
for (j = 1; (ch = argv[i][j]) != '\0'; j++)
if (ch >= '0' && ch <= '9') {
maxlines *= 10;
maxlines += ch - '0';
} else {
maxlines = default_lines;
break;
}
default_lines = maxlines;
} else {
++head;
if ((input = fopen (argv[i], "r")) == NULL) {
fputs ("head: can't open ", stderr);
fputs (argv[i], stderr);
putc ('\n', stderr);
break;
} else {
list (input, argv[i], maxlines);
fclose (input);
}
}
}
if (!head)
list (stdin, "", maxlines);
}
/* list head of a file */
list (fp, fn, maxlines)
FILE *fp;
char *fn;
int maxlines;
{
int n;
int i = 0;
char line[MAXLINE];
char *fgets ();
while ((i < maxlines) && (fgets (line, MAXLINE, fp)) != NULL) {
if (i++ == 0)
heading (fn);
fputs (line, stdout);
}
}
/* heading - print a short heading identifying file */
heading (filename)
char *filename;
{
if (head) {
fputs ("==> ", stdout);
fputs (filename, stdout);
fputs (" <==\n", stdout);
}
}
_wb_parse ()
{
}