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#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char** argv) {
regex_t* preg;
int reti;
char* linebuf;
char insection;
if(argc != 2) {
fprintf(stderr, "Usage: section <REGEX>\n");
return 1;
}
reti = regcomp(preg, argv[1], REG_EXTENDED);
if (reti) {
fprintf(stderr, "Could not compile regex\n");
return 1;
}
linebuf = (char*) calloc(4096, sizeof(char));
insection = 0;
while (fgets(linebuf, 4096, stdin) != NULL) {
if (insection) {
if (linebuf[0] != ' ' && linebuf[0] != '\t') {
insection = 0;
} else
fprintf(stdout, "%s", linebuf);
} else {
if (linebuf[0] != ' ' && linebuf[0] != '\t') {
reti = regexec(preg, linebuf, 0, NULL, 0);
if (!reti) {
fprintf(stdout, "---\n%s", linebuf);
insection = 1;
}
}
}
}
free(linebuf);
regfree(preg);
}
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