skroll

text scroller
git clone git://git.2f30.org/skroll.git
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commit 37207ba1555d324722b14db4d7a32b23a467d1b7
parent 90d79c5a47a33f322aa8a376816dde11ce8ff1f7
Author: z3bra <willy@mailoo.org>
Date:   Wed, 26 Mar 2014 14:35:25 +0100

Added comments

Diffstat:
skroll.c | 22++++++++++++++++++++--
1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/skroll.c b/skroll.c @@ -29,6 +29,7 @@ static bool loop = false; /* wether to loop text or not */ static float delay = 1; /* scroll speed, in usec */ static int number = 10; /* number of chars to be shown at the same time */ +/* fills a string with spaces if it has less than <num> chars */ void zero_fill (char **str, size_t num) { int c; @@ -36,17 +37,22 @@ void zero_fill (char **str, size_t num) s = strnlen((*str),num); + /* check every char of the buffer */ for (c=0; c<num; ++c) { + /* if the char is a new line, or if the string is to small */ if ( (*str)[c] == '\n' || c >= s ) { - (*str)[c] = ' '; + /* replace current char with a space */ + (*str)[c] = ' '; } } + /* double-check your pointers */ (*str)[num] = 0; return; /* void */ } +/* scroll <input> to stdout */ void skroll (const char *input) { int offset = 0; @@ -57,30 +63,41 @@ void skroll (const char *input) do { for (offset=0; input[offset]; ++offset) { + /* copy the number of char we want to the buffer */ strncpy(buf, input + offset, number-1); + + /* fill missing chars with spaces */ zero_fill(&buf, number); + + /* print out the buffer ! */ printf("\r%s", buf); + /* if we want a new line, let's do it here */ if (newline) putc('\n', stdout); + /* flush stdout, and wait for the next step */ fflush(stdout); usleep(delay*1000000); } + /* magnolia ? FOWEVA ! */ } while(loop); + /* And with a new line, no matter what */ putc('\n', stdout); return; /* void */ } +/* returns a char that contains the input bufferized */ const char *bufferize (FILE *stream) { char *buf = NULL; + /* allocate space to store the input */ if ( !(buf = calloc (BUFFER_SIZE, sizeof(char))) ) return NULL; - buf[BUFFER_SIZE] = 0; + /* OMG, NO MORE SPACE LEFT ON DEVICE (or no more input, in fact) */ if ( feof(stream) || !fgets(buf, BUFFER_SIZE, stream) ) { free (buf); return NULL; @@ -106,6 +123,7 @@ int main (int argc, char **argv) } } + /* SCROLL ALL THE TEXT! */ while( (buf = bufferize(stdin)) != NULL ) { skroll(buf); }