diff options
Diffstat (limited to 'ch1/no_trailers.c')
-rw-r--r-- | ch1/no_trailers.c | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/ch1/no_trailers.c b/ch1/no_trailers.c new file mode 100644 index 0000000..80dbc0f --- /dev/null +++ b/ch1/no_trailers.c @@ -0,0 +1,72 @@ +#include<stdio.h> + +#define MAXLENGTH 1000 + +int get_line(char line[], int maxlength); +void strip_line(char line[], int length); +void copy(char to[], char from[]); + +/* + * MAIN + * Removes all trailing whitespace and blank lines from STDIN. + */ +int main() { + int len; // current line length + char line[MAXLENGTH]; // current input line + + while ((len = get_line(line, MAXLENGTH)) > 0) { + strip_line(line, len); + if (line[0] != '\0') + printf("%s\n", line); + } + return 0; +} + +/* + * GET_LINE + * Read STDIN into LINE up to MAXLENGTH and return its length. + * Returns the length of a the line. + */ +int get_line(char line[], int maxlength) { + int c, i; + + for (i = 0; i < maxlength - 1 && (c = getchar()) != EOF && c != '\n'; ++i) + line[i] = c; + if (c == '\n') { + line[i] = c; + ++i; + } + line[i] = '\0'; + return i; +} + +/* + * STRIP_LINE + * Remove all whitespace from end of LINE of given LENGTH. + */ +void strip_line(char line[], int length) { + int i, c; + + for (i = --length; i >= 0; --i) { + c = line[i]; + + if (c == ' ' || c == '\t' || c == '\n') + line[i] = '\0'; + else + break; + } +} + + +/* + * COPY + * Copy FROM into TO; assume TO is big enough. + */ +void copy(char to[], char from[]) { + int i; + + i = 0; + while ((to[i] = from[i]) != '\0') + ++i; +} + |