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| -rw-r--r-- | toys/ls.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/toys/ls.c b/toys/ls.c new file mode 100644 index 00000000..b9b963ac --- /dev/null +++ b/toys/ls.c @@ -0,0 +1,113 @@ +/* vi: set sw=4 ts=4: + * + * ls.c - list files + * + * Copyright 2012 Andre Renaud <andre@bluewatersys.com> + * + * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ls.htm + +USE_LS(NEWTOY(ls, "F1a", TOYFLAG_USR|TOYFLAG_BIN)) + +config LS + bool "ls" + default y + help + usage: ls [-F] [-a] [-1] [directory...] + list files + + -F append a character as a file type indicator + -a list all files + -1 list one file per line +*/ + +#include "toys.h" + +#define FLAG_a 1 +#define FLAG_1 2 +#define FLAG_F 4 + +static int dir_filter(const struct dirent *d) +{ + /* Skip over the . & .. entries unless -a is given */ + if (!(toys.optflags & FLAG_a)) + if (d->d_name[0] == '.') + return 0; + return 1; +} + +static void do_ls(int fd, char *name) +{ + struct dirent **entries; + int nentries; + int i; + int maxwidth = -1; + int ncolumns; + + if (strcmp(name, "-") == 0) + name = "."; + + nentries = scandir(name, &entries, dir_filter, alphasort); + if (nentries < 0) + perror_exit("ls: cannot access %s'", name); + + + /* Determine the widest entry so we can flow them properly */ + if (!(toys.optflags & FLAG_1)) { + int columns; + char *columns_str; + + for (i = 0; i < nentries; i++) { + struct dirent *ent = entries[i]; + int width; + + width = strlen(ent->d_name); + if (width > maxwidth) + maxwidth = width; + } + /* We always want at least a single space for each entry */ + maxwidth++; + if (toys.optflags & FLAG_F) + maxwidth++; + + columns_str = getenv("COLUMNS"); + columns = columns_str ? atoi(columns_str) : 80; + ncolumns = columns / maxwidth; + } + + for (i = 0; i < nentries; i++) { + struct dirent *ent = entries[i]; + int len = strlen(ent->d_name); + + printf("%s", ent->d_name); + if (toys.optflags & FLAG_F) { + struct stat st; + if (stat(ent->d_name, &st)) + perror_exit("Can't stat %s", ent->d_name); + if (S_ISDIR(st.st_mode)) { + printf("/"); + len++; + } + if (S_ISREG(st.st_mode) && + (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))) { + printf("*"); + len++; + } + } + if (toys.optflags & FLAG_1) + printf("\n"); + else { + if (i % ncolumns == ncolumns - 1) + printf("\n"); + else + printf("%*s", maxwidth - len, ""); + } + } + /* Make sure we put at a trailing new line in */ + if (!(toys.optflags & FLAG_1) && (i % ncolumns)) + printf("\n"); +} + +void ls_main(void) +{ + loopfiles(toys.optargs, do_ls); +} |