95 lines
1.5 KiB
C
95 lines
1.5 KiB
C
#include "util.h"
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#include <sys/mman.h>
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int mkdir_p(char *path, mode_t mode)
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{
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struct stat st;
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int err;
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char *d = path;
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if (*d != '/')
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return -1;
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if (stat(path, &st) == 0)
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return 0;
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while (*++d == '/');
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while ((d = strchr(d, '/'))) {
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*d = '\0';
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err = stat(path, &st) && mkdir(path, mode);
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*d++ = '/';
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if (err)
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return -1;
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while (*d == '/')
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++d;
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}
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return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
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}
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static int slow_copyfile(const char *from, const char *to)
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{
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int err = 0;
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char *line = NULL;
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size_t n;
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FILE *from_fp = fopen(from, "r"), *to_fp;
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if (from_fp == NULL)
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goto out;
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to_fp = fopen(to, "w");
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if (to_fp == NULL)
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goto out_fclose_from;
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while (getline(&line, &n, from_fp) > 0)
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if (fputs(line, to_fp) == EOF)
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goto out_fclose_to;
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err = 0;
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out_fclose_to:
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fclose(to_fp);
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free(line);
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out_fclose_from:
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fclose(from_fp);
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out:
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return err;
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}
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int copyfile(const char *from, const char *to)
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{
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int fromfd, tofd;
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struct stat st;
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void *addr;
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int err = -1;
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if (stat(from, &st))
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goto out;
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if (st.st_size == 0) /* /proc? do it slowly... */
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return slow_copyfile(from, to);
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fromfd = open(from, O_RDONLY);
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if (fromfd < 0)
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goto out;
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tofd = creat(to, 0755);
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if (tofd < 0)
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goto out_close_from;
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addr = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fromfd, 0);
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if (addr == MAP_FAILED)
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goto out_close_to;
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if (write(tofd, addr, st.st_size) == st.st_size)
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err = 0;
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munmap(addr, st.st_size);
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out_close_to:
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close(tofd);
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if (err)
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unlink(to);
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out_close_from:
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close(fromfd);
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out:
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return err;
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}
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