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#include <sys/stat.h>
#include <sys/wait.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
static char *argv0;
static int
single(int argc, char *argv[])
{
char size[10], target[4096], source[4096];
char *p;
ssize_t r;
int fd;
p = strchr(argv[0], 'x');
if (!p)
return 1;
*p = '\0';
stpcpy(size, argv[0]);
*p = 'x';
p = strchr(p, '/');
if (!p)
return 1;
p = stpcpy(stpcpy(source, "scalable"), p);
if (strcmp(&p[-4], ".png"))
return 1;
stpcpy(&p[-4], ".svg");
for (p = argv[0]; (p = strchr(p, '/')); p++) {
*p = '\0';
if (mkdir(argv[0], 0777) && errno != EEXIST) {
fprintf(stderr, "%s: mkdir %s 0777: %s\n", argv0, argv[0], strerror(errno));
return 1;
}
*p = '/';
}
r = readlink(source, target, sizeof(target) - 1);
if (r >= 0)
target[r] = 0;
if (r >= 0 && (r >= sizeof(target) - 1 || r < 4 || strcmp(&target[r - 4], ".svg"))) {
return 1;
} else if (r < 0 && errno == EINVAL) {
fd = open(argv[0], O_WRONLY | O_CREAT | O_TRUNC, 0666);
if (fd < 0) {
fprintf(stderr, "%s: open %s O_WRONLY|O_CREAT|O_TRUNC 0666: %s\n", argv0, argv[0], strerror(errno));
return 1;
}
if (fd != STDOUT_FILENO) {
if (dup2(fd, STDOUT_FILENO) != STDOUT_FILENO)
fprintf(stderr, "%s: dup2 %i 1: %s\n", argv0, fd, strerror(errno));
close(fd);
}
execlp("rsvg-convert", "rsvg-convert", "-w", size, "-h", size, "-f", "png", source, NULL);
fprintf(stderr, "%s: execvp rsvg-convert: %s\n", argv0, strerror(errno));
return 1;
} else if (r < 0) {
fprintf(stderr, "%s: readlink %s: %s\n", argv0, source, strerror(errno));
return 1;
} else {
stpcpy(&target[r - 4], ".png");
if (symlink(target, argv[0])) {
if (errno == EEXIST) {
unlink(argv[0]);
if (!symlink(target, argv[0]))
return 0;
}
fprintf(stderr, "%s: symlink %s %s: %s\n", argv0, target, argv[0], strerror(errno));
return 1;
}
return 0;
}
}
static int
multi(int argc, char *argv[])
{
char *source, output[4096], target[4096];
char *p, *q;
pid_t pid;
int status, fd, i;
ssize_t r;
source = *argv++, argc--;
q = strchr(source, '/');
if (!q)
return 1;
for (i = 0; i < argc; i++) {
stpcpy(stpcpy(stpcpy(stpcpy(output, argv[i]), "x"), argv[i]), q);
for (p = output; (p = strchr(p, '/')); p++) {
*p = '\0';
if (mkdir(output, 0777) && errno != EEXIST) {
fprintf(stderr, "%s: mkdir %s 0777: %s\n", argv0, output, strerror(errno));
return 1;
}
*p = '/';
}
}
r = readlink(source, target, sizeof(target) - 1);
if (r >= 0)
target[r] = 0;
if (r >= 0 && (r >= sizeof(target) - 1 || r < 4 || strcmp(&target[r - 4], ".svg"))) {
return 1;
} else if (r < 0 && errno == EINVAL) {
p = stpcpy(stpcpy(stpcpy(stpcpy(output, argv[0]), "x"), argv[0]), q);
stpcpy(&p[-4], ".png");
for (; *argv; argv++, argc--) {
pid = argc == 1 ? 0 : fork();
if (pid == -1) {
fprintf(stderr, "%s: fork: %s\n", argv0, strerror(errno));
return 1;
}
if (pid) {
p = stpcpy(stpcpy(stpcpy(stpcpy(output, argv[1]), "x"), argv[1]), q);
stpcpy(&p[-4], ".png");
if (waitpid(pid, &status, 0) != pid) {
fprintf(stderr, "%s: waitpid rsvg-convert: %s\n", argv0, strerror(errno));
return 1;
}
if (status)
return 1;
continue;
}
fd = open(output, O_WRONLY | O_CREAT | O_TRUNC, 0666);
if (fd < 0) {
fprintf(stderr, "%s: open %s O_WRONLY|O_CREAT|O_TRUNC 0666: %s\n", argv0, output, strerror(errno));
return 1;
}
if (fd != STDOUT_FILENO) {
if (dup2(fd, STDOUT_FILENO) != STDOUT_FILENO)
fprintf(stderr, "%s: dup2 %i 1: %s\n", argv0, fd, strerror(errno));
close(fd);
}
execlp("rsvg-convert", "rsvg-convert", "-w", *argv, "-h", *argv, "-f", "png", source, NULL);
fprintf(stderr, "%s: execvp rsvg-convert: %s\n", argv0, strerror(errno));
return 1;
}
} else if (r < 0) {
fprintf(stderr, "%s: readlink %s: %s\n", argv0, source, strerror(errno));
return 1;
} else {
stpcpy(&target[r - 4], ".png");
for (; *argv; argv++) {
p = stpcpy(stpcpy(stpcpy(stpcpy(output, *argv), "x"), *argv), q);
stpcpy(&p[-4], ".png");
if (symlink(target, output)) {
if (errno == EEXIST) {
unlink(output);
if (!symlink(target, output))
continue;
}
fprintf(stderr, "%s: symlink %s %s: %s\n", argv0, target, output, strerror(errno));
return 1;
}
}
return 0;
}
}
int
main(int argc, char *argv[])
{
argv0 = *argv++, argc--;
if (argc == 1)
return single(argc, argv);
if (argc > 1)
return multi(argc, argv);
return 1;
}
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